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Posted: 2/24/2013 5:45:59 PM EDT
We haven't seen much posted about this different and unique rifle.  Yes, it's a piston but I say it's different and unique because Colt's approach to the parts is quite unusual.  Rather than use a solid rod, Colt added a swivel joint.  This joint allows the piston to "float" free of the rod.  This, in theory at least, keeps the piston from adding any undue stress on the barrel when things start heating up.

Here's the assembled rifle.  Note that Colt used a built-in folding front sight rather than a railed gas block.  Excess gas is vented out the small bleed-off hole located on both sides of the block.


To access the piston, the small captured pin is pushed out as far as it will go.  This allows the piston parts to be removed as a complete unit.  Note the opposing grooves in the block.  These help free the piston if it's frozen in place from carbon.  Twisting the plug will cam it against these surfaces and help with removal.



The piston assembly removed from the rifle.  


The piston parts disassembled.


The transfer rod is attached to the piston by means of a small internal snap ring.  The two parts are easily seperated by simply pulling them apart.


The piston.  Note the three small gas rings.


The ball on the end of the transfer rod that works as the joint for the piston.






Link Posted: 2/24/2013 5:56:47 PM EDT



Originally Posted By Melvin_Johnson:


We haven't seen much posted about this different and unique rifle.  Yes, it's a piston but I say it's different and unique because Colt's approach to the parts is quite unusual.  Rather than use a solid rod, Colt added a swivel joint.  This joint allows the piston to "float" free of the rod.  This, in theory at least, keeps the piston from adding any undue stress on the barrel when things start heating up.



Here's the assembled rifle.  Note that Colt used a built-in folding front sight rather than a railed gas block.  Excess gas is vented out the small bleed-off hole located on both sides of the block.

http://img.photobucket.com/albums/v221/tokarev/P1020010_zpse40fe559.jpg



To access the piston, the small captured pin is pushed out as far as it will go.  This allows the piston parts to be removed as a complete unit.  Note the opposing grooves in the block.  These help free the piston if it's frozen in place from carbon.  Twisting the plug will cam it against these surfaces and help with removal.

http://img.photobucket.com/albums/v221/tokarev/P1020007_zpse2430066.jpg





The piston assembly removed from the rifle.  

http://img.photobucket.com/albums/v221/tokarev/P1010986_zps690bcb09.jpg



The piston parts disassembled.

http://img.photobucket.com/albums/v221/tokarev/P1010987_zpsab78bd58.jpg



The transfer rod is attached to the piston by means of a small internal snap ring.  The two parts are easily seperated by simply pulling them apart.

http://img.photobucket.com/albums/v221/tokarev/P1010989_zps51515f87.jpg



The piston.  Note the three small gas rings.

http://img.photobucket.com/albums/v221/tokarev/P1010990_zps8497dbc2.jpg



The ball on the end of the transfer rod that works as the joint for the piston.

http://img.photobucket.com/albums/v221/tokarev/P1010992_zps5f5ae048.jpg


I'll take one please.

 
Link Posted: 2/24/2013 6:12:30 PM EDT
[Last Edit: 2/24/2013 6:17:53 PM EDT by Einfeild]
Pics of BCG? Can you also check the lockin lug recess for a extractor support? Also pics of the chamber... Sorry for asking for so mich.
Link Posted: 2/24/2013 6:20:54 PM EDT
Surprisingly, the gas plug only has one gas port and there is no provision for suppressed settings.  I can only assume the gas vents in the block allow any overpressure to exit before adding excess gas to the system.  

I can't seem to find anyone with an AAC 51T flash hider in stock so I can't run my suppressor on the Colt for the time being.  If I can't find a 51T in a couple weeks, I'll pull one off one of my other rifles so I can see how the Colt works with a can attached.


Link Posted: 2/24/2013 6:25:10 PM EDT
Originally Posted By Einfeild:
Pics of BCG? Can you also check the lockin lug recess for a extractor support? Also pics of the chamber... Sorry for asking for so mich.


I'll see if I can't get some photos of the bolt carrier posted tomorrow.  This rifle is the newer style with the one piece carrier.  

There is no extractor support in this rifle.  As far as I know, that's something that only HK and SIG are doing.  

Link Posted: 2/24/2013 6:32:32 PM EDT
Originally Posted By Melvin_Johnson:
Originally Posted By Einfeild:
Pics of BCG? Can you also check the lockin lug recess for a extractor support? Also pics of the chamber... Sorry for asking for so mich.


I'll see if I can't get some photos of the bolt carrier posted tomorrow.  This rifle is the newer style with the one piece carrier.  

There is no extractor support in this rifle.  As far as I know, that's something that only HK and SIG are doing.  



Thanks. Wouldnt mind seein what extractor spring setup its running. Is it a standard DI bolt they are running? Does it still have the steel cam pin support in the upper?

By far one of the most looked forward to rifles in the IC. This is probably one of the most testing piston rifles ever, given that it is an evolution from the 703, to the Type-C, then the M5, and now this.
Link Posted: 2/24/2013 6:41:40 PM EDT
Originally Posted By Einfeild:
Originally Posted By Melvin_Johnson:
Originally Posted By Einfeild:
Pics of BCG? Can you also check the lockin lug recess for a extractor support? Also pics of the chamber... Sorry for asking for so mich.


I'll see if I can't get some photos of the bolt carrier posted tomorrow.  This rifle is the newer style with the one piece carrier.  

There is no extractor support in this rifle.  As far as I know, that's something that only HK and SIG are doing.  



Thanks. Wouldnt mind seein what extractor spring setup its running. Is it a standard DI bolt they are running? Does it still have the steel cam pin support in the upper?

By far one of the most looked forward to rifles in the IC. This is probably one of the most testing piston rifles ever, given that it is an evolution from the 703, to the Type-C, then the M5, and now this.


I've had the bolt out but haven't pulled the extractor to see if it has a black insert or something else.  The bolt is standard GI stuff with the gas rings.  The rifle came with an H2 buffer.  And, yes, it still has the steel insert in the upper do prevent cam pin drag.  

I tend to agree that it's likely Colt has really done its homework with this gun.  It will be interesting to see what the future holds for Colt and this design.  

Link Posted: 2/24/2013 6:45:31 PM EDT
Originally Posted By Melvin_Johnson:
Originally Posted By Einfeild:
Originally Posted By Melvin_Johnson:
Originally Posted By Einfeild:
Pics of BCG? Can you also check the lockin lug recess for a extractor support? Also pics of the chamber... Sorry for asking for so mich.


I'll see if I can't get some photos of the bolt carrier posted tomorrow.  This rifle is the newer style with the one piece carrier.  

There is no extractor support in this rifle.  As far as I know, that's something that only HK and SIG are doing.  



Thanks. Wouldnt mind seein what extractor spring setup its running. Is it a standard DI bolt they are running? Does it still have the steel cam pin support in the upper?

By far one of the most looked forward to rifles in the IC. This is probably one of the most testing piston rifles ever, given that it is an evolution from the 703, to the Type-C, then the M5, and now this.


I've had the bolt out but haven't pulled the extractor to see if it has a black insert or something else.  The bolt is standard GI stuff with the gas rings.  The rifle came with an H2 buffer.  And, yes, it still has the steel insert in the upper do prevent cam pin drag.  

I tend to agree that it's likely Colt has really done its homework with this gun.  It will be interesting to see what the future holds for Colt and this design.  



Im glad to see some actual pics of this rifle. You may be in posession of America next rifle.
Link Posted: 2/24/2013 6:51:11 PM EDT
Originally Posted By Einfeild:
Pics of BCG? Can you also check the lockin lug recess for a extractor support? Also pics of the chamber... Sorry for asking for so mich.


BCG PICS please
Link Posted: 2/24/2013 7:03:49 PM EDT
I should be able to get some photos of the inside of the upper and the BCG tomorrow.

I didn't think anyone would want to see these since pics of the upper and BCG have already been posted elsewhere.  Sorry for the oversight.
Link Posted: 2/24/2013 7:07:39 PM EDT
The BCG pics got removed before I could save them :/
Link Posted: 2/25/2013 10:33:58 AM EDT
[Last Edit: 2/25/2013 11:15:40 AM EDT by Melvin_Johnson]
Here are some additional pictures.  If there's anything else that anyone would like to see, please let me know.  I'll do my best to get the photograph(s) for you.

Here's the left side of the receiver showing the steel cam pin insert.  It has been reported that this small steel plate was added to eliminate the wear that's usually present in piston guns from "cam pin drag."  Colt is the only manufacturer I'm aware of that is adding a special plate to deal with this.  Other makers--SIG for example--is removing the material that would normally be rubbed by the cam pin.  It will be interesting to see which approach ultimately proves to be the better one.


The steel plate as seen from the inside.




The piston rod as it sits inside the upper.


The newer one piece bolt carrier.  There is no chrome lining to the interior of the carrier.  


The tail end of the bolt carrier has the raised ribs or skis as used by most makers nowadays.


Standard GI bolt.


Here's the extractor.  Black insert and gold spring.


Chromed chamber and bore.
Link Posted: 2/25/2013 11:19:51 AM EDT
[Last Edit: 2/25/2013 12:30:09 PM EDT by jkirkon]
It is interesting to note that the newer DI 6940's also have the steel cam pins installed in the upper.
I presume that Colt does this to stock only one upper receiver part in inventory for the 6940/6940P's.  
Cost saving measure perhaps.

One of my 6940's has the cam pin insert and the older one does not.
Link Posted: 2/25/2013 11:34:23 AM EDT
Originally Posted By jkirkon:
It is interesting to note that the newer DI 6940's also have the steel cam pins installed in the upper.
I presume that Colt does this to stock only one upper receiver part in inventory for the 6940/6940P's.  
Cost saving measure.

One of my 6940's has the cam pin insert and the older one does not.


Cool.  I did not know that.  It certainly would make sense that Colt would be trying to limit the amount of parts it is making/stocking for all the variants in production.  

This makes me wonder if Colt will, at some point, offer a piston conversion as part of the 6940 package.

Link Posted: 2/25/2013 11:43:06 AM EDT
[Last Edit: 2/25/2013 11:43:35 AM EDT by jkirkon]
I doubt it.
The gas block ( and most likely the complete barrel assy), BCG, and of course, the piston assy will need to be replaced in order to accomplish this.
In my mind its not cost effective.

I know someone is going to stomp on my dick for saying this but I'm not convinced that the advantages of a piston rifle are worth what the upgrade of the above parts would cost.
That being said, if I were to own a piston rifle it would be the 6940P. I'm a big fan of Colt 's monolithic upper receiver.
Link Posted: 2/25/2013 3:16:28 PM EDT
Originally Posted By jkirkon:
I doubt it.
The gas block ( and most likely the complete barrel assy), BCG, and of course, the piston assy will need to be replaced in order to accomplish this.
In my mind its not cost effective.

I know someone is going to stomp on my dick for saying this but I'm not convinced that the advantages of a piston rifle are worth what the upgrade of the above parts would cost.
That being said, if I were to own a piston rifle it would be the 6940P. I'm a big fan of Colt 's monolithic upper receiver.


I think your right on track with this statement.
Link Posted: 2/25/2013 4:28:20 PM EDT
Originally Posted By jkirkon:
I doubt it.
The gas block ( and most likely the complete barrel assy), BCG, and of course, the piston assy will need to be replaced in order to accomplish this.
In my mind its not cost effective.

I know someone is going to stomp on my dick for saying this but I'm not convinced that the advantages of a piston rifle are worth what the upgrade of the above parts would cost.
That being said, if I were to own a piston rifle it would be the 6940P. I'm a big fan of Colt 's monolithic upper receiver.




you are completely right

piston offers no real advantage that justifies the extra parts, complexity and cost.

Im not piston fan, but if I did lose my mind, it would be for the 40P

several of those features are also on the 901.  the rails on the rear of the bolt carrier for piston use, and a couple of other things are also on the LE901-S   COlt plans to offer the 901  7.62 NATO carbine in a piston version eventually, But I wouldnt pass on a DI 901 waiting on it though if some one gets hot for a P901 after they read this
Link Posted: 2/25/2013 5:48:59 PM EDT
Originally Posted By Shawnmt6601:
Originally Posted By jkirkon:
I doubt it.
The gas block ( and most likely the complete barrel assy), BCG, and of course, the piston assy will need to be replaced in order to accomplish this.
In my mind its not cost effective.

I know someone is going to stomp on my dick for saying this but I'm not convinced that the advantages of a piston rifle are worth what the upgrade of the above parts would cost.
That being said, if I were to own a piston rifle it would be the 6940P. I'm a big fan of Colt 's monolithic upper receiver.




you are completely right

piston offers no real advantage that justifies the extra parts, complexity and cost.

Im not piston fan, but if I did lose my mind, it would be for the 40P

several of those features are also on the 901.  the rails on the rear of the bolt carrier for piston use, and a couple of other things are also on the LE901-S   COlt plans to offer the 901  7.62 NATO carbine in a piston version eventually, But I wouldnt pass on a DI 901 waiting on it though if some one gets hot for a P901 after they read this


I've had the hots for a 901 for awhile now. I wouldn't mind it being DI or piston.
Link Posted: 2/25/2013 6:10:57 PM EDT
Great pics Thanks Melvin!

Really nicely done piston system from the looks of things
Link Posted: 2/26/2013 9:51:05 AM EDT
I have been wanting one of these, is there a serial number range where the 1 piece carrier started? How does it shoot?  Thanks for the pix
Link Posted: 2/26/2013 12:23:20 PM EDT
Well, guys, I'm happy to say that I got the chance to fire the rifle this morning.  Range time was limited and I didn't get to do all I wanted but I should have a good enough zero going that the rifle won't take too much tweaking when I finally do get it on paper.

Range work consisted of firing for "zero" on a 10” steel plate at 50 and 100 yards and then firing a few distance transition drills on these targets.  After this, I stuck the upper on a select-fire lower and finished off the remainder of the first magazine by running a few 2- and 3-rd bursts.  I finished off the morning with a 30rd full-auto mag dump.

Overall, the gun feels smooth and really doesn't feel any different than a Colt 6920.  No surprise there.  On full-auto, the gun seems gassed appropriately and the cyclic felt and sounded about like it does with a DI gun.

Total round count so far is only sixty rounds.  Ammo used was Wolf 62gr FMJ.

More to come....

Link Posted: 2/26/2013 1:00:14 PM EDT
COOL!!!!!

Looking forward to more indepth testing.
Link Posted: 2/26/2013 1:30:14 PM EDT
Sounds great, who has these in stock?
Link Posted: 2/26/2013 4:18:51 PM EDT
Here are some photos I stole off gunbroker showing the older piston rod and bolt carrier.  Note the two piece bolt carrier.





Link Posted: 2/26/2013 5:36:20 PM EDT
As requested.  Pics of the new bolt carrier strike face.  The impact surface is flat unlike some other designs that use a concave impact point.


Link Posted: 3/1/2013 10:09:13 AM EDT
Originally Posted By Melvin_Johnson:

The newer one piece bolt carrier.  There is no chrome lining to the interior of the carrier.  
http://img.photobucket.com/albums/v221/tokarev/P1020018_zps968d22f9.jpg


Sir, Are you talking about the chrome lining on the inside of the carrier were the bolt gas rings make contact with the carrier and slide in & out? Because my LE6940P APC with one piece BCG is chromed lines inside the carrier where the bolt rings make contact with the carrier & slide in & out.

On mine you could see the chrome lining without taking the bolt out just like a DI bolt. You can see the 1/8 chrome ring on the carrier face. When I took the bolt out & checked the chrome lining it was perfect! I did have a problem getting the bolt back in, It was REALLY tight!!

Can you please clarify?
Link Posted: 3/1/2013 1:03:14 PM EDT
[Last Edit: 3/1/2013 1:03:39 PM EDT by WarLord31]
OP - Great pics and info! Many thanks! This thread alone has got me looking into the LE6940P, basically all I need is the upper as I have more than enuf lowers.



Question - I can't find any online info telling me if this monolithic upper uses standard barrels, barrel nut, or if there's something different. I don't know of another "true" monolithic upper/fore-end combined with a piston design AND using a standard off-the-shelf "mil-spec" barrel and barrel nut. (LMT's MRP for instance has proprietary barrels.) Sorry...don't mean to hijack the OP's thread...just wondering if someone knows.  Thanks in advance!
Link Posted: 3/1/2013 1:07:23 PM EDT
Originally Posted By WarLord31:
OP - Great pics and info! Many thanks! This thread alone has got me looking into the LE6940P, basically all I need is the upper as I have more than enuf lowers.

Question - I can't find any online info telling me if this monolithic upper uses standard barrels, barrel nut, or if there's something different. I don't know of another "true" monolithic upper/fore-end combined with a piston design AND using a standard off-the-shelf "mil-spec" barrel and barrel nut. (LMT's MRP for instance has proprietary barrels.) Sorry...don't mean to hijack the OP's thread...just wondering if someone knows.  Thanks in advance!


Not a standard barrel or barrel nut.
Link Posted: 3/1/2013 3:27:39 PM EDT
Saw one today at a local gunshop, $2795 plus tax, Nice, but not that nice.
Link Posted: 3/2/2013 5:48:23 AM EDT
Originally Posted By r2d2ky:
Originally Posted By Melvin_Johnson:

The newer one piece bolt carrier.  There is no chrome lining to the interior of the carrier.  
http://img.photobucket.com/albums/v221/tokarev/P1020018_zps968d22f9.jpg


Sir, Are you talking about the chrome lining on the inside of the carrier were the bolt gas rings make contact with the carrier and slide in & out? Because my LE6940P APC with one piece BCG is chromed lines inside the carrier where the bolt rings make contact with the carrier & slide in & out.

On mine you could see the chrome lining without taking the bolt out just like a DI bolt. You can see the 1/8 chrome ring on the carrier face. When I took the bolt out & checked the chrome lining it was perfect! I did have a problem getting the bolt back in, It was REALLY tight!!

Can you please clarify?


Yep.  The interior bore on the bolt carrier is not chromed on my rifle.  The bolt is a standard GI part--to include gas rings--but there's no chromed surface anywhere on the bolt carrier.  

I'll see if I can't get a picture this afternoon.  

Link Posted: 3/2/2013 6:23:16 AM EDT
Nice info Mel.

It is interesting that Colt can use the gas rings and the AA needs to use a spring and the removal of the gas rings.
Link Posted: 3/2/2013 1:05:01 PM EDT
Nope.  No chrome here.

I don't think any is needed since there aren't any hot gasses getting blown into the carrier.

Link Posted: 3/2/2013 1:24:00 PM EDT
Originally Posted By Melvin_Johnson:
Nope.  No chrome here.

I don't think any is needed since there aren't any hot gasses getting blown into the carrier.

http://img.photobucket.com/albums/v221/tokarev/utf-8BSU1HLTIwMTMwMzAyLTAwMzQ5LmpwZw_zpscc0f4667.jpg


Odd no chrome there. Double checked mine & it is definitely chrome lined. Anybody else have a colt LE6940P APC with one piece BCG. Chrome Lining or not?
Link Posted: 3/2/2013 3:03:03 PM EDT
Interesting.

Thanks for the updates!
Link Posted: 3/3/2013 5:01:28 PM EDT
[Last Edit: 3/3/2013 5:18:11 PM EDT by r2d2ky]
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?
Link Posted: 3/4/2013 7:16:16 PM EDT
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.
Link Posted: 3/4/2013 8:12:05 PM EDT
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Thank you for your time. My bolt was tighter than normal.
The fact that mine is chrome lined & yours is not is very odd.
I guess the only thing consistent with colt is inconsistency.
Link Posted: 3/4/2013 8:32:01 PM EDT
Originally Posted By r2d2ky:
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Thank you for your time. My bolt was tighter than normal.
The fact that mine is chrome lined & yours is not is very odd.
I guess the only thing consistent with colt is inconsistency.


It's more of an evolution to the platform, which is why there are different revisions out there.
Link Posted: 3/4/2013 8:55:00 PM EDT
[Last Edit: 3/4/2013 8:55:57 PM EDT by r2d2ky]
Originally Posted By Einfeild:
Originally Posted By r2d2ky:
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Thank you for your time. My bolt was tighter than normal.
The fact that mine is chrome lined & yours is not is very odd.
I guess the only thing consistent with colt is inconsistency.


It's more of an evolution to the platform, which is why there are different revisions out there.


They are both the same one piece bcg. I understand the revision from the two piece bcg to the one the one piece bcg, but one one piece bcg chrome lined & another one piece bcg not?
Link Posted: 3/4/2013 9:09:06 PM EDT
Originally Posted By r2d2ky:
Originally Posted By Einfeild:
Originally Posted By r2d2ky:
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Thank you for your time. My bolt was tighter than normal.
The fact that mine is chrome lined & yours is not is very odd.
I guess the only thing consistent with colt is inconsistency.


It's more of an evolution to the platform, which is why there are different revisions out there.


They are both the same one piece bcg. I understand the revision from the two piece bcg to the one the one piece bcg, but one one piece bcg chrome lined & another one piece bcg not?


I'm sure there is an engineering reason behind it.
Link Posted: 3/5/2013 12:07:57 AM EDT
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Is the barrel simply a MEDCON?  Or does it have the M203 mounting flats?

With the Army going to RO921HB barrels exclusively for new purchases, it probably makes sense to start "upgrading" the commercial lines around the "milspecs" regardless of any other reasons - conceivably, and potential replacement for the M4/M4A1 will use a similar barrel profile anyways.  

~Augee
Link Posted: 3/5/2013 4:18:10 AM EDT
Originally Posted By Augee:
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Is the barrel simply a MEDCON?  Or does it have the M203 mounting flats?

With the Army going to RO921HB barrels exclusively for new purchases, it probably makes sense to start "upgrading" the commercial lines around the "milspecs" regardless of any other reasons - conceivably, and potential replacement for the M4/M4A1 will use a similar barrel profile anyways.  

~Augee


It has the M203 mounting flats.

Link Posted: 3/5/2013 11:35:39 AM EDT
[Last Edit: 3/5/2013 11:36:31 AM EDT by lotsagas4u]
Well, I could not stand it anymore, went back to the shop and bought the 6940P.  Have it apart on the kitchen table as of now. It does not have any internal chrome in the carrier as stated earlier. My carrier has a grainy, greenish finish on it, being the newer 1 piece design also. Overall finish is very nice with no scrapes or scuff marks.
I had a little trouble getting the piston back in the plug, due to the piston rings. I suppose they will wear in after a few hundred rounds. Hope to take it out this weekend for a run, This was the first 6940P my dealer had received, thought I might as well jump on it, or regret it later when it was gone. Neat design< I hope it shoots as good as it looks, OH, and thanks Melvin_Johnson, you got me started on this
Link Posted: 3/5/2013 9:15:44 PM EDT
I am no expert but its seems close to the Adams Arms style.  With additional parts to the piston with the rings and such.  I do like the carrier to the colt more due to the landing support for the op rod.
Link Posted: 3/6/2013 2:45:29 AM EDT
[Last Edit: 3/6/2013 3:18:07 AM EDT by lotsagas4u]
Had a brainfart this morning, does anyone know if the bolt gas rings are the same rings for the piston?
Link Posted: 3/6/2013 4:58:19 AM EDT
[Last Edit: 3/6/2013 4:59:25 AM EDT by r2d2ky]
Originally Posted By lotsagas4u:
Had a brainfart this morning, does anyone know if the bolt gas rings are the same rings for the piston?


Yea same bolt & rings as a DI. Only the carrier is different.
Link Posted: 3/6/2013 7:00:24 AM EDT
Originally Posted By Augee:
Originally Posted By Melvin_Johnson:
Originally Posted By r2d2ky:
Did you have trouble trying to reinstall the bolt?
Was it tight?
Mine appears to have a socom profile barrel, how about yours?


The bolt fit is pretty snug just like it is on a nice new tight DI gun.

Mine is the SOCOM barrel profile, too.


Is the barrel simply a MEDCON?  Or does it have the M203 mounting flats?

With the Army going to RO921HB barrels exclusively for new purchases, it probably makes sense to start "upgrading" the commercial lines around the "milspecs" regardless of any other reasons - conceivably, and potential replacement for the M4/M4A1 will use a similar barrel profile anyways.  

~Augee


Mine has the flats too.

Link Posted: 3/6/2013 7:28:51 AM EDT
[Last Edit: 3/6/2013 7:59:13 AM EDT by r2d2ky]
delete
Link Posted: 3/7/2013 7:30:59 AM EDT
Are you asking if the sets of gas rings on the piston and bolt are interchangeable?

The gas rings on the piston are smaller in diameter than the ones on the bolt.

Originally Posted By lotsagas4u:
Had a brainfart this morning, does anyone know if the bolt gas rings are the same rings for the piston?




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Link Posted: 3/7/2013 7:46:56 AM EDT
Thanks, was thinking of replacement parts in my sleep the other night, had a hard time getting the piston back into the cup. Maybe easier after shooting a few hundred rounds. I really like the looks of this rifle, thanks for your reply.
Link Posted: 3/7/2013 9:23:25 AM EDT
Originally Posted By Melvin_Johnson:


wouldn't those rings have to be removed being this is a piston setup? Thanks.
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