I shoot the pistol upper and try out a new bolt, but stil have a few light strikes.
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Try a Wolff extra power spring. Should take care of that problem if you plan on ever shooting steel ammo.
I deal with a lot of different numbers of uppers and parts … Davidson can usually have a loose gas block after a few mags thats about it. but honestly that goes with a lot of other uppers when you buy a complete.. Loctite. ps ammo run wolf
Tula Ammo will do that had a buddy once we went shooting same thing all guns 4 or 5 different AR15