those are mine...
The grip is the first generation 'monster man' grip. The idea is with this grip (no pistol grip) and no collapsable stock, and no flash hider, then you can keep detachable mags. Otherwise you can have flash hider, collapsable stock, and pistol grip, but then need to 'lock' the mag on a 10rounder. Gotta love CA.

The monstermags are much better now, and professionally made, these were from a first run/proto design almost.