I got my first malfunction (new round jammed on top of the previously spent one) in my gen4 G26 after over 5000 rounds through it. I was using my TR Graham match grade slide lock for the first time, when the failure occurred half way through a mag full of Speer +P 124 grain gold dots. It was also the first time I've ever used this ammo. Has anyone has had a problem with either the MGSL or the gold dots? I didn't have any more gold dots with me, and had no further issues through 200 additional rounds (Buffalo Bore and S&B FMJ). The recoil assembly has under 1000 rounds, the mag springs are good, and the gun was clean and properly lubed - this was the first mag of the day. I'll need more range time to see if there really is a problem and narrow it down if there is, but I'm curious if anyone has had a problem with either the MGSL or the gold dots. I'm used to extremely high reliability with Glock 9mms - less than 3 previous malfunctions (not counting bad ammo) in gen 2 G17, gen 3 G19 and G26, and this current one (my favorite) in somewhere over 50K rounds.