First time i shot this gun much, put 400 rounds through it today, all factory ammo. Im pretty accurate with it, trigger is quite forgiving. I was using Wilson Combat Elite Tactical #500 8 round magazines. I was shooting at a distance of about 20 feet. For a lot of those magazines the slide would not lock back on the last round. I made sure it wasn't my grip hitting the slide release, not really sure what was causing it.
Any ideas? Here are a few pics.



It appears where the brass ejected, it left a brass color on top of the slide, right where it ejects. You can easily notice the brass color there.


Any ideas? Here are a few pics.



It appears where the brass ejected, it left a brass color on top of the slide, right where it ejects. You can easily notice the brass color there.




















































