I'm hoping I can get some feedback in fixing my "tinkering" gun. I grabbed an Argentine systema Colt 1927 to fiddle around with and enhance my knowledge of the 1911. The gun has been a wonderful learning tool but I have a nagging problem. When I first got the gun in stock form it would occaisionally stay in a half cocked position when the slidestop was released and the slide slammed home. This never occured during live fire and was really only a minor nuissance since I would fully cock and lock the gun when it happened. I have recently installed a new mainspring, new barrel, full length guiderod, 18 lb. spring. The gun seemed to be compatible with these mods but recently the problem of the gun only going to half cocked has become worse. The weapon only goes to half cocked even when fired. The weapon has essentially become like a SA Colt revolver with me having to fully cock it between shots. Anyone know what I need to replace or work on? Thanks ahead of time.