Just tested the bolt from the gun that runs beautifully in the gun that stops every 3rd to 4th shot with light strikes and the result is the same. This leads me to believe its related to the trigger or hammer mass.

Again, both guns have the same cmc tatical drop in trigger but maybe they aren't exact. I still believe the easiest and cheapest solution would be to cut the fp spring and increase the primer strike. Guess I'm off to ace to see about finding a new spring. I'll also try calling s&w on Monday to see about getting a new stock spring.

Thanks for mcmaster recommendation, where did u get it?