The first thing i shot was Blazer, and it was a little finicky, but it was straight outta the box new. The main problem is when i tried to go rapid fire and the packing grease was making the slide a little slow. So, i shot 100 rounds cleaned and lubed went out and shot another 100 rounds of blazer and no problems. Have since shot more blazer, WWB, UMC, some crappy cheap dirty stuff that was in a red and green box, and not another hiccup. Have probably put about 500 rounds through since i got the 4" model the week before the election and no issues other than the first 100. SC never had an issue with anything from what i remember.