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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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Check the bolt release spring and latch and make sure it is not sticking therefore not allowing the bolt to lock back. Does the latch move freely with the bolt held back? Also make sure the follower in the magazine is not getting hung up (with both mags I doubt that is the case but watch the follower when you pull bolt back and observe it moving up). CAUTION -just make sure mag and weapon is unloaded! Just be safe.
 
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