Not all triggers are compatible due to set points or dimensions.

Though most “Mil-spec” triggers will work with our uppers, the wide “tolerances” found and allowed in them make it impossible to guarantee that they will all work.

Our recommended single stage trigger is the Velocity 3lbs Classic or MPC.
Our recommended 2-stage trigger is the Jard AR Top Adjust with SPEED hammer, in any of the pull weights they offer.