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6/4/2017 10:44:10 PM EDT
[Last Edit: BeltFed_1][Edited] [#1]
Quote History
Originally Posted By IWC71:
I need a some guidance on the FH removal; I'm replacing it with a mount for either a Sico ASR FH for a Saker or a Griffin mount for a 30 SD.  I've scanned the previous pages and didn't find an answer to removing the Vortex. Will putting the separated  upper / barrel with vice blocks in a vice stabilize the upper enough so I don't over torque the barrel nut when removing the FH ? Do I need to use heat to loosen any thread locker ?I tried magpul BEV block but it wouldn't fit. Any suggestions appreciated.
View Quote
I have an AR901 that came with a bird cage compensator. I used a Geissele AR10 reaction rod to remove it without any problems, its a little shallow but it fit. I did not see any locktite being used. I used an AR15 armorer's tool that had the correctly sized diameter wrench slot, luckily enough. The Geissele AR10 reaction rod is pricey but it will save you from damaging your upper receiver and/or your barrel indexing pin. I myself have taken the barrel off several times on two different AR901s, so for me it was an investment. I am currently running a SiCo ASR muzzle brake on my main 901, although I still dont have the suppressor yet.

I hope this helps.
6/4/2017 11:24:01 PM EDT
[#2]
Quote History
Originally Posted By Postal0311:
IIRC it was a 22mm wrench to take the Vortex off.

No threadlocker or anything on it.

Hey, it's your gun, if you want to do things the wrong way and risk damaging it, go right ahead.
View Quote
All I need is the basic info which you provided, but not sarcasm.Thats the reason I asked to avoid doing things the wrong way.
6/4/2017 11:33:45 PM EDT
[#3]
Quote History
Originally Posted By BeltFed_1:


I have an AR901 that came with a bird cage compensator. I used a Geissele AR10 reaction rod to remove it without any problems, its a little shallow but it fit. I did not see any locktite being used. I used an AR15 armorer's tool that had the correctly sized diameter wrench slot, luckily enough. The Geissele AR10 reaction rod is pricey but it will save you from damaging your upper receiver and/or your barrel indexing pin. I myself have taken the barrel off several times on two different AR901s, so for me it was an investment. I am currently running a SiCo ASR muzzle brake on my main 901, although I still dont have the suppressor yet.

I hope this helps.
View Quote
Thank you, that clarifies my concern about the indexing pin and the upper. I didn't want to damage anything proprietary to Colt and not be able to get it fixed or replaced. I can borrow a reaction rod from a friend.
8/5/2017 10:04:43 PM EDT
[Last Edit: Badkennedy][Edited] [#4]
I've got the LE901SE model and I'm liking it slick except that the forend gets pretty hot. Does anyone make some kind of cover for the bare portion of the fore end or am I going to have to attach all the rails and use standard rail covers?
8/9/2017 12:00:23 AM EDT
[#5]
Manta makes a sort of wrap around grip that only mounts to a top rail.  You might want to try that.
8/12/2017 1:59:49 AM EDT
[#6]
I ended up modifying a KAC rail cover and bolted it directly onto the hand guard. I'll find out how much protection it provides tomorrow.
8/13/2017 9:56:12 AM EDT
[Last Edit: nitmr26][Edited] [#7]
Quote History
Originally Posted By Badkennedy:
I ended up modifying a KAC rail cover and bolted it directly onto the hand guard. I'll find out how much protection it provides tomorrow.
View Quote
I did the same with my LE901-16SEs.  I fastened KAC rail covers directly to the sides and bottom of the rails.  It seems to work very well.

I predrilled holes through the rail covers and removed the two the rail channels on the back side of the rail cover.  I found if you don't remove the rail channel on the back side of the rail cover, the rail cover won't lay flat on the rail.

I'll try to post pictures later.
8/14/2017 11:15:08 PM EDT
[#8]
Yep, that is exactly how I did it! Not sure how much it helped as I only did one on the bottom but I'm going to buy a full set so I can cover three sides and see how well it works.
9/16/2017 8:47:07 PM EDT
[Last Edit: Frost7][Edited] [#9]
Out of curiosity, has anyone tried an X-25 drum magazine in the 901? Did it work?

Manufacturer says it should work, but one Brownell's review says it doesn't. I kind of want to have one for shits and giggles.
4/19/2018 8:49:34 PM EDT
[#10]
Wat heavy buffer solutions exist for 901?
4/20/2018 10:51:38 PM EDT
[Last Edit: jt526][Edited] [#11]
So far I've seen the slash heavy buffer and the jp captured spring could be heavy by swapping out a tungsten ring. I bought two of these in the past month and Jesus have I had a hard time getting the first one where I want it with all the proprietary parts. Picked up a Marc 901SE today.

My AR901 is ridiculously over gassed with a suppressor, so I've been looking at the jp captured spring as an option.
4/22/2018 12:31:19 PM EDT
[#12]
Quote History
Originally Posted By jt526:
So far I've seen the slash heavy buffer and the jp captured spring could be heavy by swapping out a tungsten ring. I bought two of these in the past month and Jesus have I had a hard time getting the first one where I want it with all the proprietary parts. Picked up a Marc 901SE today.

My AR901 is ridiculously over gassed with a suppressor, so I've been looking at the jp captured spring as an option.
View Quote
Where did you get your 901?
4/22/2018 10:22:33 PM EDT
[Last Edit: jt526][Edited] [#13]
Well, I ordered the 901-16SE M.A.R.C. from arms unlimited about two weeks ago after getting an in stock notice. As it turns out, what I picked up was a Mexican export marked lower with the older 4 rail 16s upper. I hadn't actually inspected the gun before posting, I just glanced at it when I picked it up, and thought it had the rail sections already installed.  Box tag says LE 901-16SM.

I've emailed them to see what they actually meant to sell as the description never mentioned any of that and if I can't get the Marc model to get a return. My search for the Marc model may continue, or I might say eff it, and get a sig or dpms gen 2.

The first one, AR901, I got off gun broker.
4/22/2018 11:39:45 PM EDT
[#14]
Id offer to trade you my -SE upper for your -S upper, but I've pretty well used mine and I doubt you want something like that.
4/23/2018 8:15:43 AM EDT
[Last Edit: rdnkar][Edited] [#15]
Quote History
Originally Posted By jt526:
Well, I ordered the 901-16SE M.A.R.C. from arms unlimited about two weeks ago after getting an in stock notice. As it turns out, what I picked up was a Mexican export marked lower with the older 4 rail 16s upper. I hadn't actually inspected the gun before posting, I just glanced at it when I picked it up, and thought it had the rail sections already installed.  Box tag says LE 901-16SM.

I've emailed them to see what they actually meant to sell as the description never mentioned any of that and if I can't get the Marc model to get a return. My search for the Marc model may continue, or I might say eff it, and get a sig or dpms gen 2.

The first one, AR901, I got off gun broker.
View Quote
Wtf.  
I ordered the Marc from arms unlimited too.
I go pick it up today, I’ll let you know.
Update:
I picked it up
It came as advertised
901-16se M.A.R.C.
Let me know what happens with yours
4/23/2018 9:19:56 PM EDT
[Last Edit: jt526][Edited] [#16]
Goddamnit, at least you got what you paid for. basically they said I can keep it or return it, no 901marc to replace it with. Mexican export lower has some dings, and upper is perfect, just not the Marc model I wanted.
deciding on sending it back next day or so, they said i lucked out with a "collectors piece" not sure I believe that, and I bought it to shoot.
4/23/2018 10:06:12 PM EDT
[#17]
Quote History
Originally Posted By jt526:
Goddamnit, at least you got what you paid for. basically they said I can keep it or return it, no 901marc to replace it with. Mexican export lower has some dings, and upper is perfect, just not the Marc model I wanted.
deciding on sending it back next day or so, they said i lucked out with a "collectors piece" not sure I believe that, and I bought it to shoot.
View Quote
After I read what you got I got really nervous and kinda bummed about not getting what I ordered.

The more I thought about it though, I realized it may just be a blessing in disguise. I believe Colt is killing the line for civilian 901s. They pulled it off the website everywhere except the military division ck901. If it were me I’d stuff that thing in the safe and sit on it.

Consider it an investment, someone told me once that you just don’t lose with a colt. I have found that to be very true.

Those 6920 colts with the Mexican markings were snapped up pretty quick and fetch a premium now due to the uniqueness of the item.
4/24/2018 3:08:03 AM EDT
[#18]
Quote History
Originally Posted By rdnkar:
After I read what you got I got really nervous and kinda bummed about not getting what I ordered.

The more I thought about it though, I realized it may just be a blessing in disguise. I believe Colt is killing the line for civilian 901s. They pulled it off the website everywhere except the military division ck901. If it were me I’d stuff that thing in the safe and sit on it.

Consider it an investment, someone told me once that you just don’t lose with a colt. I have found that to be very true.

Those 6920 colts with the Mexican markings were snapped up pretty quick and fetch a premium now due to the uniqueness of the item.
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By rdnkar:
Originally Posted By jt526:
Goddamnit, at least you got what you paid for. basically they said I can keep it or return it, no 901marc to replace it with. Mexican export lower has some dings, and upper is perfect, just not the Marc model I wanted.
deciding on sending it back next day or so, they said i lucked out with a "collectors piece" not sure I believe that, and I bought it to shoot.
After I read what you got I got really nervous and kinda bummed about not getting what I ordered.

The more I thought about it though, I realized it may just be a blessing in disguise. I believe Colt is killing the line for civilian 901s. They pulled it off the website everywhere except the military division ck901. If it were me I’d stuff that thing in the safe and sit on it.

Consider it an investment, someone told me once that you just don’t lose with a colt. I have found that to be very true.

Those 6920 colts with the Mexican markings were snapped up pretty quick and fetch a premium now due to the uniqueness of the item.
They did?

*looks*

Fucking hell, they did. Fuck right off Colt, this is my favorite rifle, how can you stop making it?

Guess I better budget to get a parts horse off Gunbroker and buy wear parts off Brownells. I'm not going to chuck my favorite rifle in the safe forever.
4/24/2018 2:30:36 PM EDT
[Last Edit: rdnkar][Edited] [#19]
Quote History
Originally Posted By Frost7:
They did?

*looks*

Fucking hell, they did. Fuck right off Colt, this is my favorite rifle, how can you stop making it?

Guess I better budget to get a parts horse off Gunbroker and buy wear parts off Brownells. I'm not going to chuck my favorite rifle in the safe forever.
View Quote View All Quotes
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Quote History
Originally Posted By Frost7:
Originally Posted By rdnkar:
Originally Posted By jt526:
Goddamnit, at least you got what you paid for. basically they said I can keep it or return it, no 901marc to replace it with. Mexican export lower has some dings, and upper is perfect, just not the Marc model I wanted.
deciding on sending it back next day or so, they said i lucked out with a "collectors piece" not sure I believe that, and I bought it to shoot.
After I read what you got I got really nervous and kinda bummed about not getting what I ordered.

The more I thought about it though, I realized it may just be a blessing in disguise. I believe Colt is killing the line for civilian 901s. They pulled it off the website everywhere except the military division ck901. If it were me I’d stuff that thing in the safe and sit on it.

Consider it an investment, someone told me once that you just don’t lose with a colt. I have found that to be very true.

Those 6920 colts with the Mexican markings were snapped up pretty quick and fetch a premium now due to the uniqueness of the item.
They did?

*looks*

Fucking hell, they did. Fuck right off Colt, this is my favorite rifle, how can you stop making it?

Guess I better budget to get a parts horse off Gunbroker and buy wear parts off Brownells. I'm not going to chuck my favorite rifle in the safe forever.
I understand,I don’t like having a rifle I can’t shoot. I have a few guns I’ve had to set back because they don’t make them anymore. I look at it like the folks that collect precious metals.
Good luck man. I do see the MARCs on armslist every once in a while. I’d check Texas gun trader, armslist, and gun broker several times a day.
4/24/2018 2:35:44 PM EDT
[#20]
Quote History
Originally Posted By Postal0311:
Id offer to trade you my -SE upper for your -S upper, but I've pretty well used mine and I doubt you want something like that.
View Quote
Is like to see a picture of it.
I think used and abused rifles are sexy
4/24/2018 9:00:11 PM EDT
[Last Edit: jt526][Edited] [#21]
Since this is a pic thread

AR901:


"LE901-16SM" Mexican DF Lower (dinged up right out of the box) w/ 16S upper:

4/24/2018 9:46:59 PM EDT
[Last Edit: rdnkar][Edited] [#22]
Quote History
I’ll be damned, that is cool as fuck!
I would hang on to to that.
4/25/2018 2:51:45 AM EDT
[#23]
Quote History
Originally Posted By rdnkar:
I’ll be damned, that is cool as fuck!
I would hang on to to that.
View Quote View All Quotes
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+1

Looks like a featured weapon from "Guns of the Federales."

I'd keep it!
5/8/2018 5:50:06 PM EDT
[#24]
If anyone wants that Mexico marked LE901 please email [email protected], it is being offered for $2,000
http://www.ArmsUnlimited.com
866-229-1355
Las Vegas, Nevada
[email protected]
5/10/2018 10:47:52 PM EDT
[#25]
wow I havent checked my own 901 thread for years, I had no idea  how long it has gotten,  stopped coming in  the colt forum since it seems to have been over run with the kinda posters that made me leave the AR discussion sections

thought I would drop back in for old time's sake.

Can't even recall if I posted this in here already, but here was the 8 point I killed with the  MARC901 T&E  sample colt sent me before it came out for sell.  I was the first person to kill big game with one

Attached File
shikata ga nai Kiken, Kitsui, Kitanai

Armalite of today is not the original. It's eagle arms and trying to fool you

Colt. over 50 years of combat, the real thing

www.looserounds.com
5/10/2018 11:37:46 PM EDT
[#26]
Quote History
Originally Posted By Shawnmt6601:
wow I havent checked my own 901 thread for years, I had no idea  how long it has gotten,  stopped coming in  the colt forum since it seems to have been over run with the kinda posters that made me leave the AR discussion sections

thought I would drop back in for old time's sake.

Can't even recall if I posted this in here already, but here was the 8 point I killed with the  MARC901 T&E  sample colt sent me before it came out for sell.  I was the first person to kill big game with one

https://www.AR15.Com/media/mediaFiles/150026/001-768x576-540494.JPG
View Quote
Did you keep the rifle?
Why let a bunch of douche bags run you off?
5/11/2018 1:49:09 AM EDT
[#27]
Quote History
Originally Posted By Shawnmt6601:
wow I havent checked my own 901 thread for years, I had no idea  how long it has gotten,  stopped coming in  the colt forum since it seems to have been over run with the kinda posters that made me leave the AR discussion sections

thought I would drop back in for old time's sake.

Can't even recall if I posted this in here already, but here was the 8 point I killed with the  MARC901 T&E  sample colt sent me before it came out for sell.  I was the first person to kill big game with one

https://www.AR15.Com/media/mediaFiles/150026/001-768x576-540494.JPG
View Quote
Your T&E 901 review is why I ended up buying one, and now it’s my favorite rifle by far.

Just dumped about $400 on spare parts on Brownells once I saw the 901 was dropped from the website. Sorry about everything going out of stock guys, I might have had something to do with that...

Just wish there was a way to get a spare or replacement barrel once mine eventually wears out.
5/11/2018 8:47:20 AM EDT
[#28]
Quote History
Originally Posted By Frost7:
Your T&E 901 review is why I ended up buying one, and now it’s my favorite rifle by far.

Just dumped about $400 on spare parts on Brownells once I saw the 901 was dropped from the website. Sorry about everything going out of stock guys, I might have had something to do with that...

Just wish there was a way to get a spare or replacement barrel once mine eventually wears out.
View Quote View All Quotes
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Quote History
Originally Posted By Frost7:
Originally Posted By Shawnmt6601:
wow I havent checked my own 901 thread for years, I had no idea  how long it has gotten,  stopped coming in  the colt forum since it seems to have been over run with the kinda posters that made me leave the AR discussion sections

thought I would drop back in for old time's sake.

Can't even recall if I posted this in here already, but here was the 8 point I killed with the  MARC901 T&E  sample colt sent me before it came out for sell.  I was the first person to kill big game with one

https://www.AR15.Com/media/mediaFiles/150026/001-768x576-540494.JPG
Your T&E 901 review is why I ended up buying one, and now it’s my favorite rifle by far.

Just dumped about $400 on spare parts on Brownells once I saw the 901 was dropped from the website. Sorry about everything going out of stock guys, I might have had something to do with that...

Just wish there was a way to get a spare or replacement barrel once mine eventually wears out.
Well, seeing as how a bolt alone costs $ 390 I doubt you made a huge dent.
I talked to a Colt Rep at the NRA convention, I was told they will stand behind their product and continue provide parts for the 901
5/11/2018 12:35:38 PM EDT
[#29]
Quote History
Originally Posted By rdnkar:
Well, seeing as how a bolt alone costs $ 390 I doubt you made a huge dent.
I talked to a Colt Rep at the NRA convention, I was told they will stand behind their product and continue provide parts for the 901
View Quote View All Quotes
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Quote History
Originally Posted By rdnkar:
Originally Posted By Frost7:
Originally Posted By Shawnmt6601:
wow I havent checked my own 901 thread for years, I had no idea  how long it has gotten,  stopped coming in  the colt forum since it seems to have been over run with the kinda posters that made me leave the AR discussion sections

thought I would drop back in for old time's sake.

Can't even recall if I posted this in here already, but here was the 8 point I killed with the  MARC901 T&E  sample colt sent me before it came out for sell.  I was the first person to kill big game with one

https://www.AR15.Com/media/mediaFiles/150026/001-768x576-540494.JPG
Your T&E 901 review is why I ended up buying one, and now it’s my favorite rifle by far.

Just dumped about $400 on spare parts on Brownells once I saw the 901 was dropped from the website. Sorry about everything going out of stock guys, I might have had something to do with that...

Just wish there was a way to get a spare or replacement barrel once mine eventually wears out.
Well, seeing as how a bolt alone costs $ 390 I doubt you made a huge dent.
I talked to a Colt Rep at the NRA convention, I was told they will stand behind their product and continue provide parts for the 901
Brownells didn’t have that much of each item. I depleted the charging handle, firing pins, and a few various springs and other parts just getting 1 to 4 extras depending on the item.

Good to hear about Colt continuing to provide parts. Given how rarely parts come back in stock for the 901 it probably is a good idea to have spares anyway though.
5/11/2018 10:23:02 PM EDT
[#30]
Anyone have the picture of that Colt Canada 901 handy?
5/12/2018 11:53:40 AM EDT
[#31]
Quote History
Originally Posted By ArmsUnlimited:
If anyone wants that Mexico marked LE901 please email [email protected], it is being offered for $2,000
View Quote
Oh shit, he returned it!?!
God damnit boy! I missed out on this and the 7.62x39 deal, FML I need more overtime
5/12/2018 1:23:07 PM EDT
[Last Edit: jt526][Edited] [#32]
Yeah, I am very particular, and I like my AR901 (except for the missing ambi controls!), but just couldn't handle the 16S upper. I just want a MARC. Arms Unlimited was cool about it, prepaid label etc. so no complaints there, but my search continues. I have an MBT trigger, a Razor and an Omega in jail and all the other parts waiting on the next 901 I try to buy.

Pro-tip (not sure if I mentioned this before): The gas key screw spacing is shorter on the 901, so no adjustable gas keys fit. Sad. I was hoping that'd be an easy fix for over-gassing. I've got a new adjustable gasblock to get installed on the gun below. Not sure what to do about the MARC though. Maybe convert the front sight block to DIY adjustable.

Obligatory pic:
5/12/2018 2:16:50 PM EDT
[Last Edit: rdnkar][Edited] [#33]
Quote History
Originally Posted By jt526:
Yeah, I am very particular, and I like my AR901 (except for the missing ambi controls!), but just couldn't handle the 16S upper. I just want a MARC. Arms Unlimited was cool about it, prepaid label etc. so no complaints there, but my search continues. I have an MBT trigger, a Razor and an Omega in jail and all the other parts waiting on the next 901 I try to buy.

Pro-tip (not sure if I mentioned this before): The gas key screw spacing is shorter on the 901, so no adjustable gas keys fit. Sad. I was hoping that'd be an easy fix for over-gassing. I've got a new adjustable gasblock to get installed on the gun below. Not sure what to do about the MARC though. Maybe convert the front sight block to DIY adjustable.

Obligatory pic:
https://www.AR15.Com/media/mediaFiles/158773/IMG_2669_JPG-541865.jpg
View Quote
Sweet rifle. I have a 16s also and felt like it was too heavy. I liked the feal of the MARC so I decided I needed both. If I had the cash I would have definitely bought your Mexico model too. I’ve just got too many irons in the fire at the moment to drop another couple grand.
Very good to hear AU took care of you. I am just a colt slut, I’ll take anything
5/12/2018 10:51:07 PM EDT
[#34]
Quote History
Originally Posted By rdnkar:

Did you keep the rifle?
Why let a bunch of douche bags run you off?
View Quote
Postal0311  pictures are  of that very gun actually.   We are partners and own Looserounds.com together

As for the douche bags.  I don't know man, I guess I just got tired of them and  tired of arguing with them .  they just bought a 6920 last week so they knew everything after all.
Lately I been thinking  of coming back more often.
shikata ga nai Kiken, Kitsui, Kitanai

Armalite of today is not the original. It's eagle arms and trying to fool you

Colt. over 50 years of combat, the real thing

www.looserounds.com
5/12/2018 10:53:00 PM EDT
[#35]
Quote History
Originally Posted By Frost7:

Your T&E 901 review is why I ended up buying one, and now it’s my favorite rifle by far.

Just dumped about $400 on spare parts on Brownells once I saw the 901 was dropped from the website. Sorry about everything going out of stock guys, I might have had something to do with that...

Just wish there was a way to get a spare or replacement barrel once mine eventually wears out.
View Quote
dropped from the website does not mean  "stopped making"

the 901 is still being made and is listed on the website under the military and LE stuff,  just like the  6940P and most of the other colt mainstays.
shikata ga nai Kiken, Kitsui, Kitanai

Armalite of today is not the original. It's eagle arms and trying to fool you

Colt. over 50 years of combat, the real thing

www.looserounds.com
5/12/2018 11:09:09 PM EDT
[#36]
you dawg I heard you like 901s so I put a 901 on your 901 so you can 901 as you 901

shikata ga nai Kiken, Kitsui, Kitanai

Armalite of today is not the original. It's eagle arms and trying to fool you

Colt. over 50 years of combat, the real thing

www.looserounds.com
5/12/2018 11:18:20 PM EDT
[#37]
shikata ga nai Kiken, Kitsui, Kitanai

Armalite of today is not the original. It's eagle arms and trying to fool you

Colt. over 50 years of combat, the real thing

www.looserounds.com
5/12/2018 11:22:44 PM EDT
[#38]
5/12/2018 11:30:51 PM EDT
[#39]
Quote History
Originally Posted By Shawnmt6601:
Postal0311  pictures are  of that very gun actually.   We are partners and own Looserounds.com together

As for the douche bags.  I don't know man, I guess I just got tired of them and  tired of arguing with them .  they just bought a 6920 last week so they knew everything after all.
Lately I been thinking  of coming back more often.
View Quote View All Quotes
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Quote History
Originally Posted By Shawnmt6601:
Originally Posted By rdnkar:

Did you keep the rifle?
Why let a bunch of douche bags run you off?
Postal0311  pictures are  of that very gun actually.   We are partners and own Looserounds.com together

As for the douche bags.  I don't know man, I guess I just got tired of them and  tired of arguing with them .  they just bought a 6920 last week so they knew everything after all.
Lately I been thinking  of coming back more often.
Well I hope you do make it around more. I always enjoyed your insight and reviews.
5/12/2018 11:35:40 PM EDT
[Last Edit: rdnkar][Edited] [#40]
Quote History
Originally Posted By Shawnmt6601:
dropped from the website does not mean  "stopped making"

the 901 is still being made and is listed on the website under the military and LE stuff,  just like the  6940P and most of the other colt mainstays.
View Quote View All Quotes
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Quote History
Originally Posted By Shawnmt6601:
Originally Posted By Frost7:

Your T&E 901 review is why I ended up buying one, and now it’s my favorite rifle by far.

Just dumped about $400 on spare parts on Brownells once I saw the 901 was dropped from the website. Sorry about everything going out of stock guys, I might have had something to do with that...

Just wish there was a way to get a spare or replacement barrel once mine eventually wears out.
dropped from the website does not mean  "stopped making"

the 901 is still being made and is listed on the website under the military and LE stuff,  just like the  6940P and most of the other colt mainstays.
I spoke with the colt reps at the NRA meeting and was told they all but killed the line. They will only produce VERY limited batches at undetermined times. They also told me they will keep making parts available. I asked several different reps over a two day period as I wandered through the booth. They each acted like they had been asked many times about the 901. All of their answers were similar.
Odd, I read somewhere that colt was working on releasing an updated 901 sometime 2018
So I don’t really know what to believe. I tend to lean towards the reps I spoke with though. There’s really no reason to yank it off of the website unless they plan on killing the line. They keep it on the military side due to contracts they are trying to score
5/13/2018 11:18:16 AM EDT
[#41]
That bottom one is exactly what I (and probably a lot of people) want. Unfair that Canada has them.
5/16/2018 4:56:33 AM EDT
[Last Edit: rdnkar][Edited] [#42]
Attached File
my le901-16s and 901-16se
I like SE more by far
5/27/2018 3:06:49 PM EDT
[#43]
Took mine out yesterday and shot it suppressed with a Saker. Experienced several double feeds and extraction failures. Its obviously overgassed. Anyone have any solutions for a heavier buffer and/or spring combo that can help solve the problem ?
5/29/2018 9:58:21 AM EDT
[#44]
I also shot mine with a Saker.  Definitely overgassed.  Had to put on an adjustable gas block.  I used a micro MOA govnah.  
Prior setup was stock buffer and spnico orange spring.  Overgassed, uncomfortable to shoot.
Ended up with Micro MOA govnah.  suppressed port size around 0.055.  Where the factory port size is 0.072.
Stock buffer, changed spring to tubbs flatwire.  Works great now.

If you change the gas block, you will need an armalight carbine gas tube.  The stock colt gas tube only works with colt FSB.  Unsure of what the Colt low profile gas block and tubes look like.
5/29/2018 9:17:29 PM EDT
[#45]


I just replaced the stock low profile on my AR910 with a superlative arms low profile, no need to change gas tubes.
5/29/2018 9:40:52 PM EDT
[Last Edit: IWC71][Edited] [#46]
Thanks for the responses and suggestions. Followup questions: Is there a guide on removing the handguards given the monolithic upper and barrel nut setup ? Its been awhile but I recall reading something about needing a custom tool to hold and remove the barrel nut, or send it off to Adco or a similar service to get the hard work done.

ETA: Just found the reference to Arrington Accuracy Works back on page 42 about the custom 901 barrel nut wrench, but after googling him it appears his website is no longer operational.
5/29/2018 10:53:15 PM EDT
[#47]
IWC71, what kind of 901 rail do you have?

My 901 is the early quad picatinny rail.  The bottom section can be removed.  There should be no need to mess with the barrel nut.  Changing gas blocks.  Getting out the FSB pins was a mother though.
5/29/2018 11:32:58 PM EDT
[#48]
I have the 901 MARC. Thanks for the clarification, I'm overthinking the problem and solution. Not having much experience in doing it myself due to lack of experience is a bit intimidating. I know I can remove the lower handguard via removal of the screw, but how about the upper handguard ?

I 'd love to keep the folding sight assembly but thats a nonstarter now.
5/29/2018 11:59:46 PM EDT
[#49]
The lower rail should be like the 901 LE.  Remove the screws.  On the bottom rail, close to the receiver should be a hole and tab to push.   Push the tab down (up towards the barrel) and push the lower rail forward.  Assuming the MARC is like the LE rail.

You will not be able to remove the sides and top rail.  Those are integrated with the upper receiver.

The only option I can think of if you wanted to keep the FSB would be see if Clint at Black River tactical could tap and custom insert the FSB.  I don't know if he does or would do that.  The downside is you have to figure out what port size you want and is not very easily adjustable.

http://www.blackrivertactical.com/concrete5/customtune-gas-port/

The FSB sight is at a weird height with the rail.  The rear sight is a Troy medium height sight.  Troy will not sell an individual medium height front sight.  I have been too cheap to buy a whole set of troy medium height BUIS.  I have read in other forums people have problems sighting in standard height BUIS due to the rail height.  Maybe someone else has found an alternative, hoping so.
5/30/2018 6:27:53 PM EDT
[#50]
Quote History
Originally Posted By vizsla1:
The lower rail should be like the 901 LE.  Remove the screws.  On the bottom rail, close to the receiver should be a hole and tab to push.   Push the tab down (up towards the barrel) and push the lower rail forward.  Assuming the MARC is like the LE rail.

You will not be able to remove the sides and top rail.  Those are integrated with the upper receiver.

The only option I can think of if you wanted to keep the FSB would be see if Clint at Black River tactical could tap and custom insert the FSB.  I don't know if he does or would do that.  The downside is you have to figure out what port size you want and is not very easily adjustable.

http://www.blackrivertactical.com/concrete5/customtune-gas-port/

The FSB sight is at a weird height with the rail.  The rear sight is a Troy medium height sight.  Troy will not sell an individual medium height front sight.  I have been too cheap to buy a whole set of troy medium height BUIS.  I have read in other forums people have problems sighting in standard height BUIS due to the rail height.  Maybe someone else has found an alternative, hoping so.
View Quote
Ok. I was concerned about tube realignment, so I thought the upper rail could be removed to visually inspect the work like jt526 posted. As for the sights, it sounds like too much trouble on the front sight to mess with. I'll just stay with a new/used set; Troys website doesn't show mediums, only Micro sizes and full sizes. Did they discontinue the mediums or did you mean the micro version?

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