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Posted: 3/9/2020 4:57:43 PM EDT
Does anyone know where I can get replacement piston rings for the Colt 6940p? Any help would be appreciated. I called Colt and they said they do not sell parts. Since the 6940p was not a commercial success, they never released spare parts. I have tried arms unlimited, brownells, midway, clydes. Brownells would no do a special order unless the item totaled $200. I am at the end of a rope at this point. Any help would be appreciated since at this point I have an expensive paperweight. I was told the part number was 400417.
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[#3]
Are your rings worn out, or are you just trying to get some spares? You could always send it back to Colt to gave it repaired or start a group buy.
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[#5]
Quoted:
Are your rings worn out, or are you just trying to get some spares? You could always send it back to Colt to gave it repaired or start a group buy. View Quote |
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[#6]
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[#7]
Are you able to post a picture of what you need and maybe some accurate dimensions of them? Maybe someone can help locate a suitable replacement from a different source.
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[#8]
So how many rounds did it take to get to the center of that tootsie pop?
No seriously, how many rounds did it take wear the rings down to the point you have to replace the rings? I think this is first post regarding this issue. I guess I won't be shooting mine first gen much. |
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[#9]
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[#10]
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[#12]
I got a 6940P. I'd be in for some rings to get you to the $200 threshold.
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[#13]
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[#14]
Quoted:
Did Brownells say they could actually get them if you bought $200 dollars worth of them? If so the above quote is the way to go. View Quote View All Quotes View All Quotes |
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[#15]
Either way $200 seems like a no brainer over a $1500 rifle sitting there not working.
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[#16]
Quoted:
Pony up the $200, & sell those you don't need. View Quote Anyway, pissed off at Colt. You call them up they will not sell the parts even though they have them for the APC. So much for standing by their product. They give you some bull to check with major sellers. However, they never released any of these parts to major sellers. Very disingenuous. |
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[#17]
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[#18]
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[#19]
Quoted:
Are you able to post a picture of what you need and maybe some accurate dimensions of them? Maybe someone can help locate a suitable replacement from a different source. View Quote |
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[#20]
Keep us posted on your progress. I would be in for a set or two.
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[#21]
Quoted:
Keep us posted on your progress. I would be in for a set or two. View Quote they only have two reps answering phones- Steve and Scott. This time I was told that they would not take my rifle back for out of service warranty because they do not Have the parts in stock and that they quit making the APC ( new version of the piston rifle) and that It has not been taken down from the website. Any way my advice to you guys is don’t shot your rifle until parts become available. My search continues until then it is an expensive paper weight. |
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[#22]
OP that sucks.
Would you post a picture of what the piston ring/assembly looks like? Perhaps there is an alternative... |
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[#23]
What is the round count on your rifle? I have one that I've put less than 100 rounds through and now I'm reluctant to shoot it anymore until I determine if there will be replacement parts.
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[#24]
the 6940 piston rilfe was pretty much a dud. In my opinion, it is not worth fixing. A few blew a hold wide open in the receiver. It was a good idea, that was not well tested, and never took off. Honestly, I would not shoot one. Time to move on to a new rifle. Get an LMT or HK if you like military style pistons. Colt has no interest in helping you out. They abandoned that project before their last bankruptcy.
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[#25]
Guess I’m thankful my H Clinton panic buy was for a DI 6940!!!! ??. Shit on Colt for a poor piston design ...
H |
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[#26]
OP if you decide to move on from that upper let me know.
I’d be interested in the upper alone for a project I’d like to try. |
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[#27]
I could have sworn bolt rings were the same as the ones on the piston?
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[#28]
Worst case you could put a 6940DI upper on it for a while till some rings come available. Just one option. I'm just going to use my 6940DI gun and keep the 6940P in storage.
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[#29]
Quoted: the 6940 piston rilfe was pretty much a dud. In my opinion, it is not worth fixing. A few blew a hold wide open in the receiver. It was a good idea, that was not well tested, and never took off. Honestly, I would not shoot one. Time to move on to a new rifle. Get an LMT or HK if you like military style pistons. Colt has no interest in helping you out. They abandoned that project before their last bankruptcy. View Quote View All Quotes View All Quotes Quoted: the 6940 piston rilfe was pretty much a dud. In my opinion, it is not worth fixing. A few blew a hold wide open in the receiver. It was a good idea, that was not well tested, and never took off. Honestly, I would not shoot one. Time to move on to a new rifle. Get an LMT or HK if you like military style pistons. Colt has no interest in helping you out. They abandoned that project before their last bankruptcy. I wasn't able to find anything about this, can you link a source? I did find an article about the 6940 blowing the side out of the receiver, but they admitted to running it hard. No excuse, that's what they are for, but I'd like to know more about issues specific to the 6940p. Quoted: I could have sworn bolt rings were the same as the ones on the piston? The rings on the piston are definitely smaller on the piston. I wish the OP would update his post with some information such as round count. |
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[#30]
Well, there's 2 variants of the 6940P, and the one I had, I'm %99 sure the rings on the piston were identical to the rings on the bolt. I mean I could be wrong, but IIRC mine was the later/2nd variant, and I'm pretty sure that the parts list had them as interchangeable...
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[#31]
Quoted: Well, there's 2 variants of the 6940P, and the one I had, I'm %99 sure the rings on the piston were identical to the rings on the bolt. I mean I could be wrong, but IIRC mine was the later/2nd variant, and I'm pretty sure that the parts list had them as interchangeable... View Quote I didn't know there were two variants. I got mine from Arms Unlimited when they were blowing them out, so I'm going to assume that it was the later model. I just took it apart and the rings on the bolt definitely appear to be larger. I don't have a micrometer at the house or I'd measure them. |
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[#32]
Quoted: I didn't know there were two variants. I got mine from Arms Unlimited when they were blowing them out, so I'm going to assume that it was the later model. I just took it apart and the rings on the bolt definitely appear to be larger. I don't have a micrometer at the house or I'd measure them. View Quote View All Quotes View All Quotes Quoted: Quoted: Well, there's 2 variants of the 6940P, and the one I had, I'm %99 sure the rings on the piston were identical to the rings on the bolt. I mean I could be wrong, but IIRC mine was the later/2nd variant, and I'm pretty sure that the parts list had them as interchangeable... I didn't know there were two variants. I got mine from Arms Unlimited when they were blowing them out, so I'm going to assume that it was the later model. I just took it apart and the rings on the bolt definitely appear to be larger. I don't have a micrometer at the house or I'd measure them. I don’t have any real knowledge on the 6940p but this topic interests me. I found this archived thread about them that has some info and pictures but unfortunately they have the photobucket water marks. What I seem to gather on the 2 variants is a change in the BCG from a 2 piece to a 1 piece design. The one piece might use a different piston rod. OP in this thread has the later 1 piece design and stated different rings for the piston and bolt. Maybe if someone with an earlier 2 piece BCG can confirm if the piston and bolt rings are the same but I can’t really see them being different on that end for the 2 different carriers. https://www.ar15.com/forums/ar-15/Colt_6940P__Piston_Parts_Pics/126-604811/ |
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[#33]
Quoted: I don’t have any real knowledge on the 6940p but this topic interests me. I found this archived thread about them that has some info and pictures but unfortunately they have the photobucket water marks. What I seem to gather on the 2 variants is a change in the BCG from a 2 piece to a 1 piece design. The one piece might use a different piston rod. OP in this thread has the later 1 piece design and stated different rings for the piston and bolt. Maybe if someone with an earlier 2 piece BCG can confirm if the piston and bolt rings are the same but I can’t really see them being different on that end for the 2 different carriers. https://www.ar15.com/forums/ar-15/Colt_6940P__Piston_Parts_Pics/126-604811/ View Quote The piston in my rifle is identical to the one in the link. |
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[#34]
Quoted: The piston in my rifle is identical to the one in the link. View Quote View All Quotes View All Quotes Quoted: Quoted: I don’t have any real knowledge on the 6940p but this topic interests me. I found this archived thread about them that has some info and pictures but unfortunately they have the photobucket water marks. What I seem to gather on the 2 variants is a change in the BCG from a 2 piece to a 1 piece design. The one piece might use a different piston rod. OP in this thread has the later 1 piece design and stated different rings for the piston and bolt. Maybe if someone with an earlier 2 piece BCG can confirm if the piston and bolt rings are the same but I can’t really see them being different on that end for the 2 different carriers. https://www.ar15.com/forums/ar-15/Colt_6940P__Piston_Parts_Pics/126-604811/ The piston in my rifle is identical to the one in the link. Yup, I stand corrected, the piston rings are smaller than the rings on the bolt tail in that case - I got my rifle a little after that thread cropped up, and in that thread someone asked about the rings and the ones on the piston are smaller than the bolt carrier. My memory failed me I half wish I still had my 6940P and if Colt ever gave it another go, I might pick up another...but, with the lack of spare parts (Colt said they stocked some spares in case but aren't making new parts last I checked), etc...I have enough unshootable Unicorns; I don't need another. It's a shame, because that thing shot really well IIRC...the only real detriment was that it wasn't designed or set up to be shot suppressed. Had they done some more engineering, made a two position gas regulator, etc...it might have been able to make some headway against the HK piston juggernaut. Oh well. |
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[#35]
OP, any luck on finding rings? Have you tried HK 416 style rings? If you PM me, I can send you a set to try out.
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[#36]
OP, I’m sending you a PM
I’m not sure they can help but worth a try. |
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[#38]
The first generation two piece bolt carrier; with solid key; the key is longer. The striking face is further forward than the second generation one piece bolt carrier. In addition the piston rod in the first generation is shorter then the second generation to accommodate this difference. So in addition to the above post, you would need a second generation piston rod. n Try to get one of those out of Colt.
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[#39]
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[#40]
Do you think it would be possible to find a small snap/retainer ring that is the same size as the gas ring? The gas rings on the bolt look like retainer rings.
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[#41]
Quoted: sorry.. quite off topic but couldnt resist... 10.3 piston upper in use by Italian SF (9rgt Col Moschin) https://i.postimg.cc/sgkbQX2Q/Schermata-del-2020-07-07-12-51-48.png View Quote I literally spent a year looking for one of those uppers... |
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[#42]
Quoted: I have a later production 6940P thats never been shot and ended up buying a piston carrier, mpc bolt and colt small parts to make a complete spare bcg for it from shark arms. It is identical to the one that came in my rifle from the factory. Gas rings measure the same as well. So i would guess anyone who has an older 2 piece bcg could make a spare buying all of the above and run it. If anyone wants more pictures of something let me know. https://i.imgur.com/hx1LWah.jpg https://i.imgur.com/GNwrxFt.jpg View Quote @lt1_sport Can you take pics / dimensions for the piston rings? |
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[#43]
Piston rings in mine are same as my colt di ar’s. I was thinking about this and let me ask you why you need to replace them, technically speaking they are just along for the ride with an external piston setup.
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[#44]
Quoted: Piston rings in mine are same as my colt di ar’s. I was thinking about this and let me ask you why you need to replace them, technically speaking they are just along for the ride with an external piston setup. View Quote @lt1_sport I don’t have a piston rifle so I may be confused on this. The OP is looking for gas rings that go on the piston end not the bolt. They are different. With the photos you posted above of bcg’s and this statement it seems like you think he is looking for the rings on the bolt. Can you clear up what rings you are talking about? |
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[#45]
My bad, i was talking about bcg gas rings. I will pull the piston assembly out.
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[#46]
There is a 6940P BCG and articulated piston rings on GB right now.
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[#48]
View Quote Damn, is that your post on GB? I need to sell some parts. |
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[#49]
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[#50]
The piston bolt carrier and rings sold on 8/4/20. Anyone get them here??
If so, what are the dimensions?? |
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