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Posted: 12/11/2013 3:27:32 PM EST
Thanks ahead of time for any and all help!

so I have a 16'' 7.62x39 key hole forded m4 upper, mated to a TKS billet lower milspec parts kit and milspec buffer. BCG is milspec M16.

I haven fired about 200 rounds of tul ammo no problems at all. on the 3rd time to the range it stated to not eject the shell after about 10 rounds.
I can manually extract the shell buy pulling the charging handle back with a little force and shell extracts and chambers a round like normal.
I have inspected the spent shell and there is not markings at all. any suggestions on as to fix this issue?

a heavier buffer?
Link Posted: 12/11/2013 3:58:28 PM EST
Did you lube it?
Link Posted: 12/11/2013 4:02:32 PM EST
yeah I used frog lube
Link Posted: 12/11/2013 5:14:59 PM EST
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