This is a Para Ordnance 1911 style 45 with a compensated barrel. Some times when fired the slide locks back like the mag is empty. I have tried several other mags. One thing I noticed is that when the slide is locked back that you must release the slide stop to release the slide unlike my Colt 1991 A1 that you can also achive the release by simply pulling the slide back slightly. Has any one else experienced this problem with Para or any other 1911 pistols? Do your 1911s release when you pull the slide back? Thanks in advance for your feedback.