I have a Stoner M4 that, when fired and cycling, the closing bolt strips a round and jams it between the locking lugs instead of up and into chamber. I’ve tried a lot of different magazines and none work reliably, on the other hand this M4 will shoot a Beta mag drum all day without a hitch. And to make it more frustrating my Bushmaster works great with all the magazines. Any advice is appreciated.
You need to contact KAC directly, meaning on the phone, and arrange for them to take care of it for you.