I have a 9mm 4.25 with apex trigger which was done by ATEI. I won it this way last year, probably have about 1000 rounds through it, no trigger problems, but light strikes on primer would not ignite CCI, switched to winchester and no problems. Initially terrible accuracy problems tried storm lake barrel, didn't solve the issue. Won a Bar sto barrel which I had fit, solved the problem. I just ordered the extra strength (6#) striker spring to solve light strikes. Haven't tried this yet. Needless to say very frustrating. But since the cost was free and I love the feel of the gripsrecoil I put effort into solving these issues. Definitely unhappy with S&W. Before I get a barrage of grief light strikes and accuracy seem to be issues with the full size m&p. (Yes I seat the primers deep enough yes I shot groups off the bench with multiple powder/bullet weights to no avail) it now shoots about 1 12 inches at 20 yards off the bags. A friend has the same gun but about 6 or 7 years old that will put them in the same hole. Well close anyways. I attribute that to QC or lack of. But even so I love the gun. It shoots where I point