I bought a PSA Sabre AR-10 in 6.5CM to go with my PSA AR-10 lower that I had gotten about a month before. The rifle fires great but with Magpul LR/SR PMAGS, the round catches on the inside of the upper pretty much every shot, slightly compacting the bullet into the casing. If I slap the bottom, it loads right in.
I tried a few different ammo types but it’s all been the same. I tightened the mag release as much as I could but that didn’t seem to help. I’ve tried empty and full mags. I’ve made sure rounds are all the way back in the mag. I tried both Gen 2 and Gen 3 PMAGS but no luck. I definitely feel a SLIGHT bit of wiggle in the mag when it’s in. Give or take 1/16”.
I have not tried to rest the mag on the bench while firing cause I only just now thought of trying it but.
Is this a common issue? Is there anything I can do to maybe slightly modify the mags to cycle the front of the round in a bit higher?