MK23 Magazines / Extensions

HK Parts and Heckler and Koch complete .45 ACP 17-round Magazine for HK Mark 23 and HK USP  Each mag comes fully assembled and ready for use. HK Parts takes an existing German HK 12 round magazine coupled with the +5 magazine extension and assembles...

HKP 17 Round HK USP .45 ACP/Mark 23 Enhanced Magazine - Black Our 17 round magazine starts life as a factory HK 12 round magazine then gets a capacity bump with our +5 mag extension. Compatible With: HK USP .45 HK Mark 23

HKP HK Parts and Heckler and Koch Magazine Extension Complete 19 Round - HK Mark 23 and USP .45 Designed specifically for the Mark 23 and USP .45—perfect for those who want extra firepower at the range. Each magazine comes fully assembled and ready...