I picked up a tisas 1911 B45R with a plan to upgrade parts to customize it to my liking. I haven’t really shot 1911’s in about 17 years or so. The fact that these guns are made with forged frames, slides, and barrels for a price of around $450 intrigued me, especially with the features it offers. So before I even took it out to run some rounds through it I noticed how weak the plunger spring was and how the safety had no positive disengagement. It kind of snaps on but sponges off more or less. So I knew right then and there a plunger spring assembly with a stiffer spring was in order soon but I figured I’d shoot it first to see if it was a keeper before I start dumping money into it. Well 250 rounds later this gun shoots like a dream, but I had the slide lock open with partially loaded magazines about once every 2 mags or so. Just had to release the slide either with the slide lock/release or sling shot method and was back in business. No other failures of any kind, just this annoying premature slide lock. So I shot the gun 1 handed to make sure I wasn’t hitting the slide release during recoil and it still happened once every 2 mags or so. This happened with all the mags I had (2-wilson combat,2-sig, 1-mec-gar). Just to make sure this was a slide lock/plunger issue I held the slide stop down while firing 5 magazines and it functioned 100%, other than not locking the slide to rear obviously. So my question for you guys is can a weak plunger spring also cause premature slide lock or do I need to buy a new slide lock as well as the plunger spring assembly? Slide lock doesn’t seem to be rubbing on the inside and interfereing with rounds feeding so I eliminated that possibility. If I can eliminate this issue this wlll be the one of the Best Buy’s if every had in handguns.