I have the 8" pistol version and it's done well so far. I haven't put it on paper except to get the Red Dot dialed in, and have shot steel with it since. Swapped the KAK blade for an SBA3 brace, put a Vortex Sparc AR red dot on it, swapped out the pistol grip for a Hogue, and dropped some MagPul Backup Sights on it, and really like it.
I've only briefly used the SGM mag that came with it, but otherwise have used my OEM Glock mags in it without issues.
I've only briefly used the SGM mag that came with it, but otherwise have used my OEM Glock mags in it without issues.