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With a round in the mag & looking from the front. The bullet point needs to be about a 1/16" above the the front lip. If it is then insert in lower & with the upper on ease bolt forward slowly. Were ever the point of the bullet contacts must be modified. It must have somewere to go at all times. It sounds like you are on the right track. M4 cuts will help with the transition. If it gets stuck in the mag then the follower is not pushing it up fast enough during firing or the point is not high enough. I use the NHMTG 20s & have never had any problems. Some mags just sit lower in the magwell & are problematic. Another idea is the 6 O'clock lug on the extension can be smothed out. By knocking this down some it softens the jump from the mag.
Have you tried any other mags?
Sorry this is basic info but sometimes you have to start at the begining.
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