In the summer of 2016 I bought a new Scorpion 1911 with a threaded barrel, I put about 500 rounds through it then I had an Ed Brown, stainless steel, non-threaded barrel fitted and have since put another 500 rounds through it. The last few trips to the range when I load a full mag (Trip Research 8rd) and cycle the slide by pull it fully to the rear, sporadically the slide will stay open but the slide catch is not engaged. I drop the mag and pull the slide back but it does not release and go into battery. It takes a few pulls until the slide closes. I don’t think it’s the mag since the slide catch is not engaged and the slide stays open when I drop the mag. The only other thing I can imagine that is keeping the slide from closing is the plunger lever (#29) that depresses the firing pin plunger (#45). The only other thing up there is the disconnector (#24). Other than this it has functioned very well. Anyone have any ideas as to what’s happening?

Have you tried the original barrel, and bushing?

Not yet, good idea, thanks.

The barrel idea is a good one. It may be that your locking lugs are a hair too high. Let us know if that fixes it.