quote:

Originally posted by IndianaBoy:

quote:

Originally posted by Dwill104:
. Plus, the FE bolt also has a revised angle on the bolt lugs that’s supposed to be better.

Obligatory photo.

I have a legacy ejector bolt with the updated 50 degree bolt angles. You can tell which bolt you have. The newer ones are marked with an engraved numerical 50. It does seem to shoot a little softer. But I never had any trouble with the original bolt.

The FE conversion was a little too salty for my taste, but I understand why some have opted to go that route.

Despite several thousand rounds on both bolts, I haven't had an ejector spring fail yet. Just lucky perhaps.


I love having the same manual of arms of my 5.56 ARs. It just feels natural. So smooth with 147gr subsonic ammo.

I do think the CMMG radially delay system is the sleeper PCC that doesn't get as much attention as it should.

Really nice being able to have one SBR lower that can do 9mm with endomags and any of the other regular small frame AR calibers.

quote:

Originally posted by Dwill104:
I didn’t know CMMG sold the 50 degree spring ejector bolt alone. I seem to remember looking on their web page, but didn’t see one listed.

quote:

Originally posted by 92fstech:

quote:

Originally posted by IndianaBoy:

quote:

Originally posted by Dwill104:
. Plus, the FE bolt also has a revised angle on the bolt lugs that’s supposed to be better.

Obligatory photo.

I have a legacy ejector bolt with the updated 50 degree bolt angles. You can tell which bolt you have. The newer ones are marked with an engraved numerical 50. It does seem to shoot a little softer. But I never had any trouble with the original bolt.

The FE conversion was a little too salty for my taste, but I understand why some have opted to go that route.

Despite several thousand rounds on both bolts, I haven't had an ejector spring fail yet. Just lucky perhaps.


I love having the same manual of arms of my 5.56 ARs. It just feels natural. So smooth with 147gr subsonic ammo.

I do think the CMMG radially delay system is the sleeper PCC that doesn't get as much attention as it should.

Really nice being able to have one SBR lower that can do 9mm with endomags and any of the other regular small frame AR calibers.

I got the revised 50 degree bolt from CMMG a year or two ago. And the carrier weight kit a year or two before that. It still eats ejector springs. On the upside, I now have a spare bolt that lives in the Magpul MIAD grip on the gun that's pretty easy to swap out in the field if they start dribbling out, and then I go home and swap the ejector spring again. I keep spares on hand so it's no big deal, just a minor annoyance. I still love the gun and am actually considering ordering an 8" bolt/barrel combo to put together an SBR now that the tax stamp is free.

quote:

Originally posted by 92fstech:
The only thing that I can figure is that since the bolt doesn't really lock closed like a traditional gas-operated AR, the ejector may not be pressed completely flush to the breech face when the gun fires, and as such it sustains more of a pounding under recoil than a gas gun. Or it could be something with the rim thickness of 9mm ammo as it relates to the extractor claw, which may not be pinning the case flush to the the breech every time. I shoot pretty much 100% reloads through mine, and I don't really pay any attention to the head stamp for pistol stuff, so I'm sure there's a pretty significant variance between rim thicknesses.

Ultimately I haven't really put as much effort into troubleshooting it as I probably should because the interval between problems is long enough and predictable enough to not be much of an inconvenience, and the repair is cheap and easy.

quote:

Originally posted by Mars_Attacks:
A flat spring like a flat buffer spring stops spring overcompression.