Colt 9mm question

[AZFNFAL]

Hello. I broke the hammer pin running a 9mm upper on my Colt 5.56 rifle. Doing some research it looks like I need a ramped bolt? How did Colt address the issue ? I read that the 9mm hammer is configured differently but I am concerned about the buffer retention pin. I have been in contact with a company called Colt Parts but cannot get a straight answer as to whether the 9mm bolts they sell are Colt made and ramped. The last response was " it is asColt produced the BCG and bolt". The bolt is one piece , not a BCG and bolt so I suspect the answer. Any thoughts? Thanks

[MLKWERKS]

The factory Colt 9mm 635 uses stainless steel hammer and trigger pins. They're harder/stronger than standard fcg pins.

Edited May 7, 2024 by MLKWERKS

[AZFNFAL]

any thoughts on the buffer retainer plunger? It gets hit by the square edge of the bolt ? What abought trigger and hammer hole elongation in the receiver?

Edited May 7, 2024 by AZFNFAL
spelling

[D Edwards]

ramped 9mm bolts are readily available on websites.

[Chef]

On 5/7/2024 at 10:03 AM, AZFNFAL said:

any thoughts on the buffer retainer plunger? It gets hit by the square edge of the bolt ? What abought trigger and hammer hole elongation in the receiver?

If your pins are breaking, the force required to break them is great enough to elongate the hammer hole over time.
Personally, I wouldn't run 9mm in a transferable Colt RR for fear of damaging it.
If it's a postie or a reweld, I wouldn't be concerned. When they became out of round, I'd just send it off for repair/refinish.

[AZFNFAL]

Thanks, it is a factory Colt M16A1 Carbine I bought one week after the 1986 production law went into effect. Other than the broken pin , I switched to a KNS kit , I stopped using it in 9mm. Too bad , liked it as an SMG also. Bought two Colt MO635 uppers and two Colt one piece magwell adapters and 25 Colt factory 30 round magazines and a 40 rounder from Stan Andrewski , and two Beta C mags new in the box. I guess Colt never addressed the issue and to them the receiver is expendable. I wanted to suppress one upper .............

Edited May 10, 2024 by AZFNFAL
I mis typed and accidentally closed before completition

[smkummer]

On 5/7/2024 at 11:10 AM, MLKWERKS said:

The factory Colt 9mm 635 uses stainless steel hammer and trigger pins. They're harder/stronger than standard fcg pins.

Yep, broke my standard pin on my M16A1 long time ago, used the stainless pin that came with the 9mm parts kit and it’s never broke.  Truth be told, I don’t shoot it a lot in 9mm but will start up again soon.