I am having the exact same problem on an AR pistol that I was shaking down for a friend. Will function fine for the first 6-8 shots and then fail to fully seat the next round. It has a Spikes Tactical pistol buffer kit, brand new. Using 30rd PMAGs. All premium, Federal brand .556 ammo. I too am going to try scrubbing the heck out of the chamber with some solvent and see if it helps. With the dirty operation of AR pistols it wouldn't surprise me if it was a dirty chamber. Some of the stuck rounds really needed some force to be extracted.


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