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Discussion Starter · #1 ·
I am hoping someone can help I have a brand new USC that has less than 100 rounds through it. The rifle wil not lock open either when fired or when the slide is manually pulled back within empty mag. I have used both of the stock mags and get the same thing, the twist is if I apply upward pressure to the mag when pulling the slide back it will lock open.

Any suggestions?
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