Brugger & Thomet APC9/GHM9 50 round magazine built on the same platform and performance as all F5 mfg 9mm Drum Mags. Truly an exceptional addition to any B&T collection. Fits the Beretta PMX as this technology was designed by designed by B&T. Note: Does not have a BHO feature. As with all of our drum magazines, we recommend using FMJ brass cased ammo.