As CHL Chris already suggested, try a six o'clock hold with the front sight and see what happens. Shoot slowly and if you start to flinch, take a break.
1 FTE is no big deal. if it happens consistently, try better mags.
“If ye love wealth better than liberty, the tranquility of servitude better than the animating contest of freedom, go home from us in peace. We ask not your counsels or arms. Crouch down and lick the hands which feed you. May your chains set lightly upon you, and may posterity forget that ye were our countrymen.” ― Samuel Adams