Our MPA Defender Optic Mount Is An Robust Plug In Play Option For The MPA Defender. Machined Out Of 6061 Aluminum And Anodized In Matte Black. Using The Existing Screw Holes On The MPA Defender Allows You To Add An Optic Mounting Option (For Top Chargers) And Providing You Additional Rail Space (For Side Chargers). While Also giving you an Removable 1913 Picatiny Mounting Option On The Back Plate For A 1913 Picatinny Stock/Brace.