This is my third Glock, a 23, and I've never had this happen. Went to the range this afternoon and after about 50 rnds down range, the slide started locking open every round. I pulled the slide and the mg catch wants to stay up and there is wear on the top of it that looked real fresh. I had the LW barrel in it shooting reloads as usual (LFP) I'm wondering if the fouling from the powder is somehow built up and causing the problem? The slide catch is an extended one and it happened with both mags w or w/o rnds in them or no mag at all. Thanks for any help folks.