Franken 9 Issues Sorted Out

With Unseen Killer's help, I was able to determine that my Franken 9 problems were entirely due to using printed Sten mags. There was a different problem that affects only milsurp mags, but that's fixed in UK's latest drop. If you're using milsurp mags, print the latest frame and you should be good to go.

The problem with printed mags is that the dimensions deviate significantly from production magazine drawings. Every design I checked was wider at the feed lips and flared more steeply than specs call for. Most are also about 1mm shorter font-to-back. As a result, they won't seat deep enough to reach the mag catch or feed correctly (or at all). To be clear, there's nothing the Franken 9 can do to fix this -- the incompatibility is with the Glock slide itself.

I didn't want to print new mags just for this build, but curiosity got the best of me. I remixed a "spec-ish" version of the DMB Sten v1.1 and squirted a test print in PLA Pro. With that the Franken 9 is able to feed 100% reliably in dummy round function testing. I haven't been able to range test yet, but if that goes well, I'll post my spec-ish Sten mag remix for anyone that wants a non-milsurp option.