Looking for a lightweight” high quality polymer magazine for your ZPAP85? These 5.56 magazines will be the perfect fit! The polymer frame contains a steel reinforced rear locking lug. The magazine has a BHO (bolt hold open) and follower that are also steel reinforced. They are tested at high and low temperature ranges and must exhibit consistent strength” resistance to shatter” and lubricity from -40 C/F to +60 C/140 F.