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Your photos appear to show; slag, or crap milling job which wasn’t cleaned up in breechface, which you have circled in Red.
I’d dress that down/clean it up so you lose that kick up of cartridge off the breechface.
Also see a sliver of extractor body showing proud above breechface, which is also holding case head off of breechface.
It’s nearly microscopic though.
I would also dress this down to flush/just past flush.
Wager it will function fine in spite of this, but it isn’t “right”.
Thanks for the advice. I actually filed down the extractor body you mentioned this morning to correct that, but I didn't take a new picture. Is the breech face something you would just carefully go at with a file?Quote:
Originally Posted by gaijin
I would, yes.
Machinists/ needle files; triangle and whatever they call the flat one with no cutting surface on edges.
May need to finish with a stone.
Go slow, use magnification-jewelers google or similar.
Got it, thanks again!Quote:
Originally Posted by gaijin
Took some precision files and a very small and sharp chisel (as a scraper) to it. Maybe not perfect, but much better.
Before:
https://i.imgur.com/COYvpET.jpg?1
After:
https://i.imgur.com/mobSbPe.jpg?1
Looks good.
What was that apparent “glob” seen in top photo?
Thank you. Just a metal ridge left behind from milling. My research shows it's from the "J" cut. I'm not sure what that means, but apparently that's what it is and isn't too terribly uncommon but isn't correct.Quote:
Originally Posted by gaijin
Sort of what I thought.
Follow up report on live fire function please.
Absolutely. I'm thinking Tuesday I'll go put about 500rds through it.Quote:
Originally Posted by gaijin
First range trip posted here: https://www.m4carbine.net/showthread...79#post2809479