Just a follow-up on the premature lock up of the slide. Kahr sent me a new slide lock spring and all of the various rounds that did fire had no slide lock issues. The only issues out of about 200 rounds were 3 sqibs from the Monarch brand (from the same box). I loaded those back in the mag and they all fired the second time. I had no problem with WWW, S&B, PMC, or Win PDX1. I am still amazed with the accuracy of this BUG. It is a keeper!