FN Five-seveN Mk3 20-Round Factory Magazine

This is FN America's factory 20-round magazine for the Five-seveN MRD/Mk3. It holds 20 rounds of 5.7x28mm in a black polymer body and uses a polymer follower. FN identifies the exact current-generation part as MPN 20-100682 and official eStore SKU FN22B-A668.

Fitment stops at the MRD/Mk3. FN marks this magazine as incompatible with the Mk2, and the MRD owner's manual says the pistol's magazine is unique to the MRD. Mk1, USG, IOM, and Mk2 owners need their generation-matched magazine rather than relying on the shared Five-seveN name.