The CompMag is fixed magazine device for shooters in states with "Assault Weapon" restrictions such as California. This device is a 10-round, fixed, loadable magazine that locks into the firearm. This solution creates an ammunition feeding device that is attached to the firearm that cannot be removed without disassembly of the firearm action. The Gen 3 CompMag automatically locks into place once inserted into the firearm. Using the CompMag allows you to keep features such as the pistol grip, telescoping stock, forward grip and flash hider. The CompMag features easy installation, round count indicator, last round bolt hold open, and allows for easy type 3 malfunctions. Compatible with AK-47 and AKM firearms that accept a double stacked magazine. For Milled Receivers you must purchase the additional AK-47 Milled Receiver Locking Plate. Compatible with 7.62x39 Ammunition. Compatible with the Galil ACE (you will need the milled locking plate). Compatible with Palmetto State Armory KS-47 and Billet Rifle Systems BRS-47 lowers, but you must flatten out the locking plate to allow the upper receiver to close. You can do this easily by tapping the plate on a flat surface with a hammer or by squeezing the plate in a vise. With some VEPR and SAIGA models a trunion bullet guide may need to be installed to accept standard AK-47 magazines.