Ok i have a new MPX carbine with a velocity drop in 4.5lb trigger with a Elftmann push button safety. I finally got to shoot it today. The only thing noticeable before shooting was the safety was sticking sometimes. Everything went great at first but then I noticed something wasn't right. It was starting to fire very very rapidly. I installed the trigger and selector per instructions. I even talked to the owner of Velocity before hand to make sure there would be no issues with it in the MPX and talked to him about the install process. But i still think its something dealing how i installed it. I put the trigger in and then the safety and then tightened down the set screws in the trigger housing and tightened down the second set of locking screws. Nothing complicated about that.
Any suggestions or ideas?