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You must use 300 blk magazines and this ammo will cycle just fine. 5.56 magazines aren’t recessed enough for 300 blk sub Sonic ammo. AMMO INC. is not your problem. They manufacture quality ammo. There is a difference iin the delivery feed using the 300blk mags. If that’s not the problem your feed ramps and gas are the problem. I use this ammo in 5 different guns including yours with zero issues
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