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Posted: 8/28/2015 10:15:26 AM EDT
I recently bought an Adams Arms XLP piston kit for my 10.5 SBR. Haven't gotten the time to install it and try it out yet. But as soon as I took it out of the box, I was impressed. Can't wait to get it installed and head to the range.

Now, after watching numerous youtubes and reading articles I'm seriously looking at either getting the 7.5 Adams Arms upper or building my own with a kit. I have yet to find any failures mentioned.

Any experiences or comments?
Link Posted: 8/29/2015 10:55:09 AM EDT
[#1]
As soon as my paperwork comes back from ATF I'm going to install an Adams Arms upper 7.5 on mine.  Can't wait!!!!  Gonna be neat!
Link Posted: 8/29/2015 7:06:09 PM EDT
[#2]
Link Posted: 8/29/2015 7:35:36 PM EDT
[#3]
I have several kits and have fired thousands of rounds without any issues.





fatkid
Link Posted: 8/29/2015 9:57:30 PM EDT
[#4]
Love the 7.5. Never a hiccup

Link Posted: 8/31/2015 5:21:24 PM EDT
[#5]
Always my luck. I installed it last night and went to the range this morning. I now have a single shot gas piston rifle.

I followed the instructions in the video step by step.

I tried three types of ammo. American Eagle M193, Military Issue M855 green tip and my reloads.
I tried adjusting the gas block through all settings.
I tried four different brands of magazines. Two different generation magpul, Lancer and GI aluminum.
I different weight buffers.

The most it would do is fire one round and eject the case without picking up the next round.

It's got to be something  simple I missed.
Link Posted: 8/31/2015 7:00:33 PM EDT
[#6]
Link Posted: 8/31/2015 9:18:33 PM EDT
[#7]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Maybe the gas hole in the barrel isn't aligned with the block fully? Did you take the rings off the bolt? I doubt it's the latter anyways but worth a try. Also, does the op-rod move freely in and out when you remove the BCG?
View Quote


I went back and checked that again. Yes, I took the rings off the bolt beforehand. I'm running a Troy Alpha Rail and I had to take it and the flash hider off to get to the operating rod. The XLP system does not allow the rod to pass through like the older models.

I'm going to go back to the range tomorrow and try again. I'm also going to switch and swap some buffers of different weights to see if that makes any difference.

I sent an email to Adams Arms to see if they have any solutions.
Link Posted: 9/1/2015 8:25:34 PM EDT
[#8]
Got an email back from Adams Arms. They said to make sure that my barrel nut was .85 in length and to use a 3oz carbine buffer. I'm going to check things out and give another update after I get back from the range.
Link Posted: 9/2/2015 4:26:00 PM EDT
[#9]
ALl my toys have AA pistons.  As a lefty in a righty world if I run a standard DI gun wet as it likes to be I get oil spatter all over my eye protection.  I run the AA pistons and grease in all of my uppers... problem eliminated.  Add to that I can run crappy dirty ammo, and long strings of fire, and no worries about heat or crap in my action.

I will also say that AA has some of the best customer service around.  Had a few issues (that were NOT their fault, btw) and they helped me out anyway.  So long as you do the install right there really is no down side to them.
Link Posted: 9/2/2015 8:47:03 PM EDT
[#10]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
ALl my toys have AA pistons.  As a lefty in a righty world if I run a standard DI gun wet as it likes to be I get oil spatter all over my eye protection.  I run the AA pistons and grease in all of my uppers... problem eliminated.  Add to that I can run crappy dirty ammo, and long strings of fire, and no worries about heat or crap in my action.

I will also say that AA has some of the best customer service around.  Had a few issues (that were NOT their fault, btw) and they helped me out anyway.  So long as you do the install right there really is no down side to them.
View Quote


I'm also left handed. The oil never bothered me, I just accepted it and moved on. My first experience with a piston gun was a Sig 556. I have DI AR SBR's and wanted an SBR piston upper for one of them. I like to hear that it works well with various ammo. I usually go with the cheap stuff at matches cause I usually don't get a chance to pick up my brass. Hopefully I can get things sorted out and get it running right.

If I do, I'm considering purchasing an Adams Arms 7.5 upper next.
Link Posted: 9/3/2015 1:26:22 PM EDT
[#11]
I picked up the 7.5 Evo a couple weeks ago. I have put 300 rounds of just random stuff I had. It ate everything I fed it. I read they don't like steel case,but mine took it fine.
Link Posted: 9/4/2015 12:27:32 AM EDT
[#12]
I ave an AA piston kit in my rifle with a 16.1" barrel and rifle length gas system. I have no problems with it.

Check your piston gas block and make sure you have the setting correct. The AA piston blocks have a gas adjustment. Not cycling is a lack of gas problem. The rifle isn't getting the bolt back far enough for it to pick up the next round.

Link Posted: 9/8/2015 12:48:06 PM EDT
[#13]
I just replaced a TNW system with the AA system.  Turned into a modified single shot. It's ejecting the spent round and chambering the new round (most of the time), but it acts like the trigger isn't reset.  If I pulled the BCG back a couple inches and let it got forward, it will fire.  Didn't have any problems with the TNW system - after I got the gas black lined up.

Checked the rod clearance like it said and tried it at all three settings with three different brands of ammo and it's still doing the same thing.

Any ideas?
Link Posted: 9/9/2015 4:07:49 PM EDT
[#14]
I'm just about on a first name basis with the customer support guy at Adams Arms. We've been emailing each other almost every day.

Mine is installed on a 10.5 inch SBR barrel.

I've shot a lot of rounds function testing and still haven't gotten the bugs out. It will fire a round and reset the hammer, but the bolt isn't going back far enough to lock the bolt back on the last round. The suggestions so far is a 3oz carbine buffer. A light recoil spring and full power factory ammo.

Next on the list is enlarging the gas port hole in the barrel and possibly a low mass carrier.

I really want to get one of their 7.5 factory uppers, but with the problems I'm having getting this conversion to work, I may not.
Link Posted: 9/13/2015 9:39:46 PM EDT
[#15]
Decided I'd go over everything again before I did any drilling or spending more money. Took everything completely apart, then put it back together making sure hole in barrel matched up with piston. Three ounce buffer, lightweight buffer spring. Went to the range. Went through three boxes of American Eagle XM-193, two rounds at a time. One round fired and cycled. It picked up the next round and fired. The hammer reset, but bolt did not lock to rear.

Made the decision to enlarge the gas port hole. Failed. Broke three bits in fifteen minutes. Taking the barrel to a friend who has a machine shop tomorrow. At this point, I've give. when I bought this conversion kit, I thought it was pretty much a put together and run. Not in this case. Think I'm going to give up on the idea of a 7.5 upper from Adams Arms too.

Link Posted: 9/14/2015 4:32:28 PM EDT
[#16]
Only go up a couple thou on the gas port drilling if that is what you decided to do, then test again. It can go from to little to way to much gas really fast. If you do end up with to much gas, you can go back to a heavier spring and H2 buffer.
Link Posted: 9/14/2015 7:05:06 PM EDT
[#17]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I just replaced a TNW system with the AA system.  Turned into a modified single shot. It's ejecting the spent round and chambering the new round (most of the time), but it acts like the trigger isn't reset.  If I pulled the BCG back a couple inches and let it got forward, it will fire.  Didn't have any problems with the TNW system - after I got the gas black lined up.

Checked the rod clearance like it said and tried it at all three settings with three different brands of ammo and it's still doing the same thing.

Any ideas?
View Quote


I bet you are getting bolt bounce.

When you pull the trigger does the hammer drop?
Link Posted: 9/14/2015 10:45:38 PM EDT
[#18]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


I bet you are getting bolt bounce.

When you pull the trigger does the hammer drop?
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
I just replaced a TNW system with the AA system.  Turned into a modified single shot. It's ejecting the spent round and chambering the new round (most of the time), but it acts like the trigger isn't reset.  If I pulled the BCG back a couple inches and let it got forward, it will fire.  Didn't have any problems with the TNW system - after I got the gas black lined up.

Checked the rod clearance like it said and tried it at all three settings with three different brands of ammo and it's still doing the same thing.

Any ideas?


I bet you are getting bolt bounce.

When you pull the trigger does the hammer drop?


Yes it does drop. I decided to go ahead and dril it out larger. After breaking three drill bits, I decided to take to a friend who had some better equipment to work with. Just got back home and put everything back together again. I'll go back out to the range tomorrow morning and see what happens.
Link Posted: 9/15/2015 2:34:40 PM EDT
[#19]
Went to the range today. Still not working right. When the last round is fired, the hammer resets, but the bolt is not locking to the rear. I also tried different weight buffers to see if it made a difference. Nope. It's not the mags and I was using American Eagle 5.56 ammo.

I'm quickly losing confidence in the kit. I sent another email to Adams Arms describing the problem. Waiting to see what they say next.
Link Posted: 9/16/2015 7:29:26 PM EDT
[#20]
Today's update.

The customer service guy at Adams Arms and I have exchanged a LOT of emails trying to get my rifle running the way it's supposed to. Today after trying the last suggestions on their list, they offered to send me an RMA and let them get it working. I asked about what it would cost, and they said nothing. Waiting for the next email to give me instructions for sending it to them.

Link Posted: 9/20/2015 10:37:21 AM EDT
[#21]

Discussion ForumsJump to Quoted PostQuote History
Quoted:


Today's update.



The customer service guy at Adams Arms and I have exchanged a LOT of emails trying to get my rifle running the way it's supposed to. Today after trying the last suggestions on their list, they offered to send me an RMA and let them get it working. I asked about what it would cost, and they said nothing. Waiting for the next email to give me instructions for sending it to them.



View Quote




 
Man, their customer service rocks! That is just friggin' awesome!
Link Posted: 9/20/2015 12:53:02 PM EDT
[#22]
That much I can endorse.
AA's customer service and no nonsense lifetime warranty is squared away.
Link Posted: 9/22/2015 1:37:36 PM EDT
[#23]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Today's update.

The customer service guy at Adams Arms and I have exchanged a LOT of emails trying to get my rifle running the way it's supposed to. Today after trying the last suggestions on their list, they offered to send me an RMA and let them get it working. I asked about what it would cost, and they said nothing. Waiting for the next email to give me instructions for sending it to them.

View Quote


Any updates? I just recently picked up an upper, and plan to beat the crap out of it over the next week or so to make sure it will function reliably for me. Running steel is a must, no use for a picky gun.
Link Posted: 9/23/2015 4:49:41 PM EDT
[#24]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Any updates? I just recently picked up an upper, and plan to beat the crap out of it over the next week or so to make sure it will function reliably for me. Running steel is a must, no use for a picky gun.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Today's update.

The customer service guy at Adams Arms and I have exchanged a LOT of emails trying to get my rifle running the way it's supposed to. Today after trying the last suggestions on their list, they offered to send me an RMA and let them get it working. I asked about what it would cost, and they said nothing. Waiting for the next email to give me instructions for sending it to them.



Any updates? I just recently picked up an upper, and plan to beat the crap out of it over the next week or so to make sure it will function reliably for me. Running steel is a must, no use for a picky gun.


Nothing yet. According to UPS tracking, my upper arrived at Adams Arms today.
Link Posted: 9/23/2015 4:57:49 PM EDT
[#25]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Any updates? I just recently picked up an upper, and plan to beat the crap out of it over the next week or so to make sure it will function reliably for me. Running steel is a must, no use for a picky gun.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Today's update.

The customer service guy at Adams Arms and I have exchanged a LOT of emails trying to get my rifle running the way it's supposed to. Today after trying the last suggestions on their list, they offered to send me an RMA and let them get it working. I asked about what it would cost, and they said nothing. Waiting for the next email to give me instructions for sending it to them.



Any updates? I just recently picked up an upper, and plan to beat the crap out of it over the next week or so to make sure it will function reliably for me. Running steel is a must, no use for a picky gun.


Running steel would be a plus for me too. I've tried shooting it in my other SBR and it won't function in it either. The only rifle I have that reliably shoots steel is my Sig 556.
Link Posted: 9/24/2015 1:04:48 PM EDT
[#26]
Anyone having issues should email [email protected] he will get everything taken care of!
Link Posted: 9/24/2015 5:32:45 PM EDT
[#27]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


Running steel would be a plus for me too. I've tried shooting it in my other SBR and it won't function in it either. The only rifle I have that reliably shoots steel is my Sig 556.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Today's update.

The customer service guy at Adams Arms and I have exchanged a LOT of emails trying to get my rifle running the way it's supposed to. Today after trying the last suggestions on their list, they offered to send me an RMA and let them get it working. I asked about what it would cost, and they said nothing. Waiting for the next email to give me instructions for sending it to them.



Any updates? I just recently picked up an upper, and plan to beat the crap out of it over the next week or so to make sure it will function reliably for me. Running steel is a must, no use for a picky gun.


Running steel would be a plus for me too. I've tried shooting it in my other SBR and it won't function in it either. The only rifle I have that reliably shoots steel is my Sig 556.


I took mine to the range Wednesday, and only had 3 failures to pick up the next round out of 90, but that's still enough for me to take the barrel for a gas port resize. I should be going Sunday to do so.
Link Posted: 9/25/2015 12:17:32 PM EDT
[#28]
Another update from me, 500 flawless round with anything brass, BCG is spotless, but I slow-mo videoed my range trip today, and its obvious that the steel isn't ejecting hard enough to be pushing the BCG back far enough. Course of action is still to oversize the gas port a little.
Link Posted: 9/28/2015 2:52:23 PM EDT
[#29]
Got an email from Adams Arms today. They told me that the gas port was not the proper size and had to be enlarged to .078. They also said that they had enlarged the gas port, reinstalled the conversion kit and test fired it. According to the UPS tracking number they gave me, it should be here Wednesday 9/30/15. So far, they have not mentioned any charges for their work. In my return email I offered to pay for any services.

As soon as it gets back, I'll go to the range and test it out.
Link Posted: 9/28/2015 3:32:33 PM EDT
[#30]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Got an email from Adams Arms today. They told me that the gas port was not the proper size and had to be enlarged
View Quote



Not the first time I've read this.
I hope AA invest more in their QC.
Link Posted: 9/28/2015 3:51:21 PM EDT
[#31]
Discussion ForumsJump to Quoted PostQuote History
Quoted:



Not the first time I've read this.
I hope AA invest more in their QC.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Got an email from Adams Arms today. They told me that the gas port was not the proper size and had to be enlarged



Not the first time I've read this.
I hope AA invest more in their QC.


It was MY barrel, not theirs. It was a conversion kit that I had bought and installed. It didn't work right and I contacted them and they offered to check it out and fix it for free.
Link Posted: 9/28/2015 4:38:57 PM EDT
[#32]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


It was MY barrel, not theirs. It was a conversion kit that I had bought and installed. It didn't work right and I contacted them and they offered to check it out and fix it for free.
View Quote View All Quotes
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Got an email from Adams Arms today. They told me that the gas port was not the proper size and had to be enlarged



Not the first time I've read this.
I hope AA invest more in their QC.


It was MY barrel, not theirs. It was a conversion kit that I had bought and installed. It didn't work right and I contacted them and they offered to check it out and fix it for free.

Ah, well that's interesting. I've never known AA to modify someone else's product for free.

I retract my earlier sentiment but not the comment. AA does need to tighten up on QC.

Still,  +1 on their customer service. That portion of their business is fully squared away in my opinion.

Link Posted: 9/28/2015 7:10:41 PM EDT
[#33]
Link Posted: 9/28/2015 8:40:11 PM EDT
[#34]
Discussion ForumsJump to Quoted PostQuote History
Quoted:


What barrel did you use, might I ask? I am running mine on a DD 16" Gov't Middy, and it has been flawless.
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Discussion ForumsJump to Quoted PostQuote History
Quoted:
Quoted:
Quoted:
Quoted:
Got an email from Adams Arms today. They told me that the gas port was not the proper size and had to be enlarged



Not the first time I've read this.
I hope AA invest more in their QC.


It was MY barrel, not theirs. It was a conversion kit that I had bought and installed. It didn't work right and I contacted them and they offered to check it out and fix it for free.


What barrel did you use, might I ask? I am running mine on a DD 16" Gov't Middy, and it has been flawless.


It's a 10.5 CMMG barrel that I bought from their website.
Link Posted: 9/30/2015 6:37:10 PM EDT
[#35]
Just got my upper back today. Too late to go to the range today.
Link Posted: 10/1/2015 6:54:57 AM EDT
[#36]
And, just my luck. I get up early this morning cause I'm anxious to go to the range, let the dogs out and it's raining. Sorry, but not wading mud today. So, I guess I'm going to spend today getting ready for a match that may be cancelled Sunday due to weather.
Link Posted: 10/2/2015 8:49:26 AM EDT
[#37]
I got lucky. It didn't rain as much as the weatherman said it would. Went to the range. Not much change.

Wolf ammo. Will fire and cycle, but will not lock to the rear on the last round.

My reloads. 55 gr FMJ boat tail loaded with 24.0 grains H-335.  Same results.

American Eagle M-193 55 gr bought at Academy Sports. Rifle functions like it's supposed to.

The rifle will function fine with full power factory loads, but not with anything else. My goal is to have my SBR shoot anything I put in it.

Considering other options.

1. Bigger gas port.
2. Lighter Buffer
3. Low mass bolt carrier.



Link Posted: 10/2/2015 10:29:40 AM EDT
[#38]
I re gassed you upper to function with a standard carbine buffer and spring, it should function with any ammo in that set up. i tested it with factory reloaded 55gr 223.
if you are using an H or H2 it may prevent lockback. if you are already using a standard buffer (3oz) if i recall correctly the port is at .078. you should be able to safely open it up to .085. if it is just not locking back and you are already using a 3oz buffer i would open it .002 from what its at. if you are using a heavy buffer, i would start with a lighter one first.
Link Posted: 10/2/2015 11:53:08 AM EDT
[#39]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I re gassed you upper to function with a standard carbine buffer and spring, it should function with any ammo in that set up. i tested it with factory reloaded 55gr 223.
if you are using an H or H2 it may prevent lockback. if you are already using a standard buffer (3oz) if i recall correctly the port is at .078. you should be able to safely open it up to .085. if it is just not locking back and you are already using a 3oz buffer i would open it .002 from what its at. if you are using a heavy buffer, i would start with a lighter one first.
View Quote


You guys have been GREAT with your customer service. You don't find that very often anymore.

I was using a 3 oz buffer like we discussed in our emails.
Link Posted: 10/5/2015 3:47:06 AM EDT
[#40]
Thought I might chime in on this thread.  I just installed an XLP on my Anderson RF85 Upper/Lower/Barrel.  Using the Geissele SD3G Trigger,  AA VDI Lifecoat Low Mass BC + AA VDI Lifcoat Firing Pin + POF Roller Cam Pin + KNS Perma-Pin + NP3 Plus Reliabolt w/ Sprinco 5-Coil Extractor Springs/O-Ring/Mil Spec (black) Insert (all came in Sprinco spring kit), Magpul UBR Stock, Kynshot RB5000 Hydraulic Recoil Damper Buffer w/ Sprinco RED Extra Power Buffer Spring.

I've only put about 265 rounds through this AR.  No failures to extract or anything.  The only malfunctions I've gotten were either user error or because of the mag.  Actually no.  My buddy was bumpfiring and there were a few failure to fires.  The firing pin struck, however it failed to fire.  I'm assuming this has something to do with the trigger hammer vs bumpfiring.  Could be the springs as well.  Anyone else have any ideas?

I haven't put any 556 or steel ammo through it yet.  I'm assuming I should be fine though?
Link Posted: 10/5/2015 1:15:56 PM EDT
[#41]
Wanted to throw my experience in here. Took My rifle to a gunsmith in the area, had the gas port opened up and the rifle ran through 150 rds of Tula steel without a hiccup. Very pleased. I would have to ask the gunsmith the dimension of the bit he used, but Ive been just so excited that this was all I needed to do.

Firecop, I would have the gas port opened up that last little bit. If You have overgassing issues, you can always run a heavier buffer.
Link Posted: 10/5/2015 9:16:48 PM EDT
[#42]
I have an AA piston set up on a carbine length and it works just fine except with magpull mags .They drag the carrier down too much on the forward stroke .Other wise its functioning fine .I have built a lot of Ars and I had a few that would not lock back because I put a badass or other bolt stop /finger release on them and I think the weight slows them down too much to react to the bolt speed .Put stock bolt stop on them and they worked fine .
Link Posted: 10/7/2015 11:13:57 AM EDT
[#43]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
Wanted to throw my experience in here. Took My rifle to a gunsmith in the area, had the gas port opened up and the rifle ran through 150 rds of Tula steel without a hiccup. Very pleased. I would have to ask the gunsmith the dimension of the bit he used, but Ive been just so excited that this was all I needed to do.

Firecop, I would have the gas port opened up that last little bit. If You have overgassing issues, you can always run a heavier buffer.
View Quote


That was my thoughts too. If it were a little over gassed, it may just take resetting the piston selector to a different position.
Link Posted: 10/11/2015 10:12:47 PM EDT
[#44]
Got the gas port opened up a little bigger. Going to the range tomorrow. I'm going to go to Academy Sports first to get several brands of ammo and see what happens. I think Wolf and Tula are probably the lowest velocity. I have some American Eagle on hand plus my reloads.
Link Posted: 10/12/2015 8:10:04 AM EDT
[#45]
Let me know how it runs. Ive been nothing but pleased with mine after the gas port work. For those following, I had my port opened up to .085, and havent seen any short-stroking or failures of any kind. Amazed at how clean this bolt is with 1000rds through the gun!
Link Posted: 10/12/2015 3:00:11 PM EDT
[#46]
Just got back from the range. I shot three types of ammo. Tula 55 grain, my 55 grain reloads with 24 grains of H-335 and American Eagle XM-193 55 grain.

I used four different magazines. A Lancer, a gen-2 and and gen-3 magpul and a GI aluminum mag.

For this test, I loaded two rounds in each magazine. Fire one round, check for cycling or short stroking, fire second round, bolt locks to the rear.

I also tried two different weight buffers. A 3oz buffer and am H-2.

Every round with every magazine and buffer functioned perfectly.
Link Posted: 11/23/2015 1:59:25 AM EDT
[#47]
This is all good to know. I have a 16" upper from RRA that put an AA piston set in earlier this year. Immediate single shot. Same symptoms- fires one, won't cycle far enough to strip a new round. In all honesty, I only got to test it that one time and when it failed, I benched it. I just haven't been back, but I feel like the problem is also most likely gas port related. I'm hoping I'm just misaligned. But life has been in the way. I wish I could just send it out to be set up correctly.
Link Posted: 11/23/2015 10:30:55 PM EDT
[#48]
Wolf ammo is very under powered, and most of the recommendations I've seen for AA or Huldra (which is what I've got) is to run full power ammo.

Now there is a Wolff reduced power buffer spring available that will allow you to reliably cycle under powered ammo.
It's a 10 second swap to shoot the cheap stuff, then stuff the regular spring in for the full power ammo, easy fix.
Link Posted: 11/23/2015 11:08:32 PM EDT
[#49]
I had one for a few months but after about 200 rnds I could not for the life of me get the gas setting to adjust, ended up having to use a hammer and punch...  Is this normal? I since went back to DI with a Micro MOA gas block and haven't had this issue
Link Posted: 11/25/2015 7:36:58 PM EDT
[#50]
Discussion ForumsJump to Quoted PostQuote History
Quoted:
I had one for a few months but after about 200 rnds I could not for the life of me get the gas setting to adjust, ended up having to use a hammer and punch...  Is this normal?
View Quote


Nope. Not at all.
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