Went to the range today with my Colt (LW) Commander. It has been plated with NP3+ by Robar, and also received the "reliability" package at the same time. On the two previous trips since being plated, everything worked fine. Today, however, I started to notice problems. I was using McCormick SS 8 rnd magazines (the kind with rubber bumpers on the base), and Winchester 230 gr PDX1 ammo. I noticed that the slide was not locking back after the last round. I thought this was strange but continued to shoot. Then it started to jam (not feeding all the way up into the chamber) and I noticed that the slide stop was working its way out the left side of the gun! This is my 1st 1911, and am still learning the ins and outs of proper care and feeding of the 1911, so I am wondering where to start in looking for the reason for this? Any ideas or suggestions would be appreciated. If it something mechanical, I plan on taking it back to Robar's and asking them to fix it, but would like to have an idea of what is wrong before I do that. Thank you for your help in advance! John Wanna kill these ads? We can help!