Arizona_Mike
Member
- Joined
- Feb 15, 2013
- Messages
- 3,452
I've posted before about my disconnector problems trying to get my 9mm upper to work with the match grade trigger in my lower (to avoid a second lower and tax stamp). By relocating the takedown pin hole upward slightly, I've reduced the failure to disconnect rate from 100% to below 2% (when the gun is right side up) and I am now 100% confident that the gun will never double when the hammer follows the BCG. I think putting a brass set screw in the bottom of the rear lug has a good chance of solving my problems for good.
Horrible jams: bullets were hitting the underside of the feed insert on my Hahn Precision block. When this happened on the left side of the mag, they flipped nose up when they finally past the ramp and ended up as "compressed loads".
I filed it to be just shy of overhanging the mag now. The last round hold open is now more reliable as the follower is not rubbing on the block. I expect the problem will be fixed. I suspect to get LRHA to be 100% reliable I will have to reduce the hold open spring or remove the extra weight of the BAD Lever. The 9mm mags have a weaker spring than 5.56.
At some point I went from strong firing pin strikes (with some of the holes even looking a little dark/deep) to weak strikes that appear shallow even when they fire. It looks like my firing pin tip chipped at some point also the rear firing pin part is peening over where the hammer hits it shortening the effective hammer travel which is short by design on 9mms).
Also, unless someone has started to make 9mm belted cases, I appear to have suffered one OOB out of 116 rounds fired (into a brass catcher so I know it's mine). I know the gun did not double. The firing pin tip is really rough on the side and slightly peened over so I suspect it snagged.
Quite honestly the CMMG firing pin looks like a monkey made it from a sharpened nail. I hate to see this 9mm project turn into a money pit but I am going to order a Colt 2-piece firing pin and spring.
Anyone know where I can get the Colt OEM parts cheaply?
Mike
Edit: I'm looking on line and don't see a 2-peice firing pin anywhere. Did my pin snap at the transition from the thick to narrow part??? That might explain all the tip damage as well as the OOB! I need to see if the inside of my BCG is chewed up too much.
Horrible jams: bullets were hitting the underside of the feed insert on my Hahn Precision block. When this happened on the left side of the mag, they flipped nose up when they finally past the ramp and ended up as "compressed loads".
I filed it to be just shy of overhanging the mag now. The last round hold open is now more reliable as the follower is not rubbing on the block. I expect the problem will be fixed. I suspect to get LRHA to be 100% reliable I will have to reduce the hold open spring or remove the extra weight of the BAD Lever. The 9mm mags have a weaker spring than 5.56.
At some point I went from strong firing pin strikes (with some of the holes even looking a little dark/deep) to weak strikes that appear shallow even when they fire. It looks like my firing pin tip chipped at some point also the rear firing pin part is peening over where the hammer hits it shortening the effective hammer travel which is short by design on 9mms).
Also, unless someone has started to make 9mm belted cases, I appear to have suffered one OOB out of 116 rounds fired (into a brass catcher so I know it's mine). I know the gun did not double. The firing pin tip is really rough on the side and slightly peened over so I suspect it snagged.
Quite honestly the CMMG firing pin looks like a monkey made it from a sharpened nail. I hate to see this 9mm project turn into a money pit but I am going to order a Colt 2-piece firing pin and spring.
Anyone know where I can get the Colt OEM parts cheaply?
Mike
Edit: I'm looking on line and don't see a 2-peice firing pin anywhere. Did my pin snap at the transition from the thick to narrow part??? That might explain all the tip damage as well as the OOB! I need to see if the inside of my BCG is chewed up too much.
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