First thing that came to mind was gas block misalignment. Are you using a typical A2 Front Sight Base? Pinned or screwed? ...or are you using a clamp on gas block? Either way I'd check alignment gas block/front sight to port with a bore scope...or lacking that, with the spaghetti noodle trick. LMK if you need a description of the noodle trick.
Last edited by ChrisF; 03/23/24.
