I’m seeing some ejector marks and extractor shavings when shooting Federal XM193 factory ammo (primers seem ok). Is this common with this ammo in a carbine length gas 16" barrel? Lighter 223 loads sometimes have a faint ejector mark, but no extractor cuts.
Specs:
CMMG 16" barrel carbine length gas 5.56 1/7 chrome lined.
AR-15 bolt carrier
sprinco blue CS spring
H3 buffer
Welcome to 5.56 pressure :lol:
Is it ok to reload this brass so long as the rim isn’t deformed? Doesn’t appear to be pulling the rim too much, and the cuts seem to smooth out or flake off after running through the tumbler.
Looks like you may need to tune up your ejector. Maybe chamfer the edges. What make is your bolt?
Looks just like my xm193 brass go through the normal precautions.
chamfer the ejector hole, or the ejector itself? Bolt is CMMG.
Ejector itself. Chuck it in a drill and spin and chamfer it.
Pretty thorough description here
Perfectly normal result of shooting XM193. I wouldn’t go modifying any part of my weapon.
Thanks for the link. I have an extra ejector, so I can do some low risk experimenting. One thing I’m confused about however, is I was under the impression after reading some posts from Randy at AR15 barrels that the brass flaking is caused by the brass being elastic and flowing into the ejector hole at the same time the bolt face is unlocking, thus the hole edge is the part shearing the flakes. I’m not discounting that a sharp ejector edge could be a part of that equation however.
Thank you, good to know. I wanted to make sure I wasn’t seeing something out of the norm.
While it is normal, cleaning up the edge of questionable ejector increases reliability and reduces ejector pocket fouling. With the right tools its a fifteen minute job.
I did the ejector chamfer thing it improves the ejector marks on 5.56 by just a tiny,tiny amount. I will also add that I did not go hog wild with the dremel neither.