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Posted: 8/16/2004 4:06:15 PM EST
Seen some ads for a machined firing pin retainer to replace the cotter pin. Anyone try it? they worth the price?
Link Posted: 8/16/2004 7:07:18 PM EST
I haven't, because just as I was about to order some a few months back, we had a rash of postings on the site about the things breaking after very little use.

That changed my mind
Link Posted: 8/16/2004 8:19:04 PM EST
I use them in my M16 and M16A1 look-alikes to maintain originality.

I have never broken or even bent one. Guys that are having trouble with them generally have notched hammers and disconnectors that are out of time and allowing the hammer to follow the bolt carrier. The hammer notch catches the collar of the firing pin and drives it back into the retainer pin causing it to bend.

If everything is working as designed you won't bend or break the retainer.
Link Posted: 8/17/2004 1:38:58 PM EST
Hey, that's good to find out

I built up an early M16 clone last year, complete w/original Colt hard chromed smoothside carrier and bolt, and the early retainer would have finishes it off just fine. Looks like I'll have to give them a try after all
Link Posted: 8/17/2004 1:40:48 PM EST
You would'nt be interested in parting with the Colt Chromed Bolt/Carrier would you?
Link Posted: 8/17/2004 5:54:06 PM EST
I ordered two of those pieces of crap. Broke them both putting them in. They are very brittle! Never had a prob with the cotter pin, but I'm a gear junkie. Learned my lesson.
Link Posted: 8/18/2004 1:37:03 AM EST

Originally Posted By garr:
You would'nt be interested in parting with the Colt Chromed Bolt/Carrier would you?



Nope
Link Posted: 8/18/2004 2:15:32 AM EST
I've been running one in my 16" Bushy for about 6 mos. now with no problems. It was a bit tight going in the first few times. Can't say it's any better than the cotter pin cause I never had trouble with those either. I'd say if you have trouble installing the cotter pin it would be worth it to try one of the solid pins.

Shabo
Link Posted: 8/18/2004 2:30:46 AM EST
I see it as a solution without a problem.
Link Posted: 8/18/2004 3:03:21 AM EST
i tired one on my benchrest rifle for a while, damn thing kept falling out whenever i removed my b/c for cleaning which did not give me a lot of confidence, last time it happened i replaced it with a GI pin.
Link Posted: 8/18/2004 3:49:58 AM EST
Link Posted: 8/18/2004 3:52:07 AM EST

Originally Posted By dbshabo:
I've been running one in my 16" Bushy for about 6 mos. now with no problems. It was a bit tight going in the first few times. Can't say it's any better than the cotter pin cause I never had trouble with those either.




+1
Link Posted: 8/18/2004 3:52:11 AM EST
What problem are they supposed to solve?
Link Posted: 8/18/2004 4:44:31 AM EST

Originally Posted By zrxc77:
What problem are they supposed to solve?



None, They just give a early AR build another retro part!
Link Posted: 8/18/2004 10:03:34 AM EST
Okay. Thanks.
Link Posted: 8/18/2004 11:19:43 AM EST

Originally Posted By Russ4777:
I use them in my M16 and M16A1 look-alikes to maintain originality.
<snip>



Russ: These were not used on M16A1s. Nobody that I knew during 1984/87 had one, we all had coter pins.

Link Posted: 8/18/2004 11:59:59 AM EST
These things were replaced by the cotter pin before 1971, when I went through basic. I have a couple anyway, just to try. After breaking one, I used a small screw driver to align them on the inside of the bolt carrier, before pushing them through the first time.
Link Posted: 8/18/2004 12:30:15 PM EST
CB1:

I was an an 11B from 1969 to 1971. The M16A1 I carried for 5 of the 12 months I was in RVN was equipped with a chrome bolt / carrier assy and had the solid firing pin retainer. The cotter key type retainers had not even been adopted into the design at that time.
Link Posted: 8/18/2004 12:46:27 PM EST

Originally Posted By Russ4777:
CB1:

I was an an 11B from 1969 to 1971. The M16A1 I carried for 5 of the 12 months I was in RVN was equipped with a chrome bolt / carrier assy and had the solid firing pin retainer. The cotter key type retainers had not even been adopted into the design at that time.



chrome bolt and carrier?

I've got an SP1. It's got no forward assist, but a standard bolt and carrier, with forward assist notches. I'm looking to make it more original.
Link Posted: 8/18/2004 1:07:45 PM EST
Nam:

I recently built an M16 look-alike with no forward assist. I got the notchless carrier to make it original from DPMS. They are available in both chrome and without. If they are not in-stock, you may have to wait awhile to get one. DPMS only submits their orders to the supplier that makes the notchless carriers when they get a bunch of backorders. Good luck.
Link Posted: 8/18/2004 3:40:45 PM EST

Originally Posted By Russ4777:
CB1:

I was an an 11B from 1969 to 1971. The M16A1 I carried for 5 of the 12 months I was in RVN was equipped with a chrome bolt / carrier assy and had the solid firing pin retainer. The cotter key type retainers had not even been adopted into the design at that time.



somewhere between 71 and 84 they must have changed it. I was 11B also, until I became 11M

No chrome bolt/carriers, solid FP retainer in the 80's. good info tho, I did not know that the bolt/carriers were chrome that "late" in the war. see? you learn something new everyday!
Link Posted: 8/18/2004 4:01:01 PM EST
I had one. It broke pulling it out one day. Brownells refunded my money and I bought 2 packages of 10 (20 total) cotter pins in an exact exchange. Ive only broke one cotter pin and that one was my fault.
Link Posted: 8/18/2004 4:05:01 PM EST
I saw a police 11.5" gun the other day with one of those in it, it had backed out a little during firing and was chewing the shit out of the upper. We replaced it with a standard cotter pin and the gun started running again.
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