Just a quick post to recognize rockmup for some good advice I picked up from one of his posts. I searched and couldn't find it but basically he said to stick with the MAK90 trigger rather than going with a Tapco replacement. Originally I had gone with a Tapco FCG as part of my conversion and 922r update. I went back to the MAK90 FCG and replaced some other parts to gain compliance. The stock MAK90 set up is smoother than the Tapco and I'm glad I switched back.