I'll consider to look for some. The piston rings appear like the bolt rings but at smaller. The outer diameter is about .375 of the inch and the interior diameter about .310 of an inch.

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I did check the G&R web-site and made an effort to add the Colt uppers into the cart and acquire the away from inventory information.  Sucks.

Possibly if an individual with the earlier two piece BCG can verify In the event the piston and bolt rings are the identical but I'm able to’t genuinely see them getting distinctive on that conclude for that two distinctive carriers.

Posted by HOWARD L. WALLACE on 14th Mar 2018 I required a colt upper with 16" barrel to go by having an older A2 design. This was good and didn't have take off parts (hand guards/front sight). Very good price and excellent brand.

Mine didn't come with a Colt reduce receiver box like those I bought from Brownells did (it didn't have any box actually). ETA it may not be a foul thought to get in touch with Colt using your A4 serial range and possess them check if it had been logged as being a receiver or a rifle when it remaining the manufacturing unit.

  The manufacturing unit pistol grip and inventory and like-new too, and the two parts have not been off on the gun or altered in any way.  Based on the Blue Reserve this Colt came with a Magpul Gen2 again-up flip sight from your factory, but according to the unique owner this gun didn't have any rear sight.  No matter whether this was a manufacturing facility oversight Or even the early guns did not have a rear sight, we don't know.  Irrespective, the preceding proprietor acquired an extremely wonderful MATECH adjustable flip-up sight to pair using this gun and it is in like-new condition.  This sight has quick-adjust configurations for ranges from 200 to 600 yards, and is also windage adjustable by using a knurled knob on the appropriate aspect of your sight.  The initial factory-problem Magpul GenM3 thirty-round magazine remains to check here be sealed in the original packaging, and the initial transport bag, operator's manual, and empty chamber flag are in excellent affliction and in the first box.  The original box is in fantastic ailment and is particularly comprehensive with the first factory end-label, that is serial numbered to this carbine.  This Colt also comes with a really great brief-adjustable and swift-release blacksling with a quick launch sling swivel to the forearm/pic rail program.  With Colt not generating this incredibly minimal-production model because mid-2015, rather than developing ANY commerical AR-15s of any variety at this point, this Design 6940P could well be a wonderful addition to any Colt or firearms assortment, and will carry on to verify for being a wonderful prolonged-time period investment decision.             

Yup, I stand corrected, the piston rings are more compact as opposed to rings around the bolt tail in that circumstance - I obtained my rifle just a little following that thread cropped up, As well as in that thread another person asked with regard to the rings and the ones over the piston are lesser when compared to the bolt copyright. My memory failed me

From my comprehension, the Brownells Colt M4 Carbine lowers were being certainly one of, if not the only real, reduced receivers that left Colt as just a receiver and will lawfully be designed into AR pistols.

I don’t have any authentic knowledge within the 6940p but this subject interests me.  I discovered this archived thread about them that has some information and photographs but sad to say they may have the photobucket h2o marks.

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Colt’s selection to provide the 6940P gas-piston AR with monolithic rail method is sound. Whilst the 6940P just isn't destined to be issued to the bulk of our army services, regulation enforcement agencies must consider using the rifle, in addition to non-public contractors and protection-aware citizens.

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