Beowulf,
Were you ever in service? I ask because your trigger control is very good, mostly 3 round bursts and you controlled muzzle rise well, most civs on rock-n-roll burn through the whole mag at one wack with some of the rounds suppressing a sniper in the trees and then going to anti-aircraft fire. I have a Vector V-93 and finding any of the HK mags very $$$$, still looking for a 25 rounder, Apex Gun parts has been my source of 40 Rounders at a good price. With the Pro-mags after some dremmel-fu locking the bolt back first then locking the mag helps but the trimming of the Pro-mag takes a few tries. Nice looking C-93s and they seem not to be the ground bolt fits or built by the dreded Century Build Monkeys.
Jump62
aka Paul