I have a Dagger compact(19G3 clone). Shoots fine, I pull it to the low left a bit. Mag springs a quite stout, hopefully they'll loosen up after some use. The squared trigger guard doesn't fit any of my holsters.
I bought one of these about six weeks ago. Shoot well enough, I need to shoot it a bit more though. Pmags fall free but springs are stiff! Very tough on fingers and thumbs.
Noticed you measuring start point is 'off' by about 1/2". Feds measure from bolt face to the muzzle. So you are probably slightly longer than you thought. Feds use a rod for measurement so try that.
I have two steel core belts. One is Alien Gear, the other is a Bigfoot. Both are now owned by Alien Gear. Had them for around eight years or so. Had problems finding quality belt around here. Use one as a work belt mostly. All prior belt would wear out in a couple years, stretch out, lip up...