Promag Polymer Drum Magazine Sig Sauer Mpx 9mm Black 30 Rd.

This drum magazine has housing constructed of proprietary DuPont Zytel based polymer. Additional components include an injection molded magazine follower and a spring formed from heat treated stainless steel.

Features:Fits SIG Sauer MPX 9mm;Heat treated stamped steel upper magazine housing ;Drum housing constructed of a proprietary DuPont Zytel based polymer;Injection molded magazine follower;Spring formed from heat treated chrome silicon wire