I've pumped six hundred rounds of wallmart special 165gr winchester fmj without a failure, and another 200rds of JHP. The point of aim with this new model is unmatched vs any comparable auto. I did add on the crimson trace (lg660) laser grip. I have big hands and the large backstrap fits best. Although crimson trace said the grip is comparable to the medium grip it appears to be the same size as the large grip! The laser grip is a must for the guy that likes gadgets. Crimson trace once again out did themselves with this new model its low profile is not even noticable at a glance. The glock will shake in its boots when stood up next to the m&p!!