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Now I'm thoroughly confused. Can you go to this diagram and use the part names they show to explain what happened. There is no "cap", and certainly nothing that fits that description that is retained with a spring. Your choices for part names are: 3. Pawl Pin 10. Forward Assist Pawl 11. Forward Assist Retainer Pin 12. Forward Assist Spring 15. Forward Assist Pawl Detent 16. Pawl Detent Spring 17. Plunger Assembly Here's the diagram 
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Not going to touch the Colt Quality issue, but after reading Humminbird's post, it makes sense, and it seems possible that the FA was depressed- but did not fully return or withdraw. Once the round was fired, the carrier slams rearward, engages the FA and ...."See-Ya" (boing!) Sticky FA action. I guess new owners can lube the FA areas, and do a function check, and minimize this from happening - to any AR15 - especially a new one In all honesty - I have checked a couple new unfired Colts of mine to see if they hang up at all. They don't but thanks to ajdrr for posting this as an "item of interest" |
I would not wait on Colt to get you the part if you want to use the weapon this spring. Anybody know someone who can lazer engrave MP testing on a roll pin?  Check Rock River the pin is probably no more then $1.25 but get it locally at a hardware as there is probably a 7 dollar min. shipping fee. |
It's been my experience that Colt will take care of these situations in a prompt and satisfactory manor. |
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The FA on my Colt LE6920 AR15M4 is not the same as any diagrams I have seen yet. In the picture below you can see the FA "plunger assembly?" with the cap and spring removed. The spring goes on, then the cap and a pin in inserted through the cap to capture the plunger. There is no other spring, the plunger can be pushed in and pulled out by hand. It is captive with #11 Forward assist retainer pin. http://infraredsystems.com/IMAGES/FA2.jpg I guess know it all's don't know it all |
Interesting. So, if you push and pull on the piece that's still in the gun, it moves back and forth about 1/4-3/8" but won't come out of the gun? I believe that the spring that you lost is part #12 in the diagram I posted, and that part #17 which is sold as a unit in fact separated due to the pin breaking. If this is the case, the pin size and # that I and others quoted you may not be correct. I would NOT try to operate the gun in this condition because if the pawl moves forward it could bind the bolt carrier as it tries to move. Best solution (if you want to do it yourself) would be to get a whole new #17, drive out pin #11, and replace it. Personally I'd sent the whole upper in to Colt and have them fix it themselves under warranty. I applologize for miunderstanding the breakage as you originally described it. |
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Yes,you can push and pull on the piece in the gun, about 3/8" , and it will not come out. If I push it in it stays in until I pull it out. I did not loose a spring, there is only one spring. I lost the pin that goes through the "cap" and "plunger / pawl" assembly. The cap holds the spring in place. The diagram seems to show the spring going in first and possibly is held by the recess in the tube. The spring sits on top of the Plunger/pawl assembly that is held in the gun, and the cap with pin secure the spring. In my picture you can see the hole through the cap and plunger where the pin goes through. When I get a new pin, I will put in the spring, push on the cap and drive the pin through. http://infraredsystems.com/IMAGES/FA1.jpg http://infraredsystems.com/IMAGES/FA3.jpg |
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Is it part of the plunger assembly above #17? It appears to be one piece, but is called an assembly. Perhaps the cap came off the plunger assembly, releasing the spring. Seems to make sense, then I would need a new #17, or send it to Colt and let them do it. I just checked my BM and there is no sign of a pin on the FA. Colt is probably closed Monday, I'll call them on Tues. |
Maybe the gun was just puking after you put that optic on it.  |
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I was wrong with the pin size in my first post, I was unaware Colt uses a 2 piece FA plunger. Both of my Colt's are just like yours, they are a 2 piece FA button. The other AR's have a 1 piece FA Button. A roll pin 0.500 long (1/2") and 0.093 (3/32") in diameter will get you running. Danny
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I can't remember where, how or why, but I got a bunch of FA small parts - pawls, springs, etc. Not sure I'll ever use them, as the FAs usually come as an assembly. |
| I have a related question. The forward assist on my Colt 6520 rotates about 20 degrees (more than the FA rotation on my 6920) and when pushed in actually misses the cut outs in the bolt, and consequently, does not shut the bolt all the way forward when actuated. Is this normal? Is there a way I can reduce the rotation play in the FA? |
That sounds messed up. The FA housing or the FA main body sounds like it may be out of spec. Maybe the roll pin hole is drilled off a few thou. |
Let's not start this argument again. |
Las post on page 2
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