Check your back plate!...It might be that your back plate may be dropping causing a clearance issue with your trigger...Try this!....Cycle the gun to set the trigger / Pull the back plate, all the way up as hard as you can with one hand and pull the trigger...If that helps...remove some metal from the trigger slot....In my case on my ORF, it took two hands to pull the trigger!...I added a piece of rubber sweeper belt in the bottom slot of the back plate groove to lift it and take away the slop..It runs like a champ now...HTH