I have a Glock 27, and I keep having a problem with misfires (firing pin hits the primer but nothing happens). 95% of the time I use cheap ammo like, Wolf, UMC, or Winchester and have had misfires with each brand of ammo. However, the Winchester seems to be the worst with about 1 out of 10 misfiring, while the other brands misfire about 1 out of 25. (I had one particularly bad box of Winchesters that misfired almost half of the box of 50.) I would think that the ammunition was causing all of my misfires except for the fact that I've never had a single misfire with any brand of ammo in my Para-Ordnance. Also, I've heard that because of the way the firing pin in a Glock hits, cheap ammo with improperly seated primers will misfire, but I don't know if that's true. So do I have an ammo problem or is my Glock defective? Has anyone else had similar problems?