This Picatinny rail is designed specifically for the new style MPA BA Mounts. The rail is attached to the front cap and secured with a male boss (fits into the female pocket on the cap) and (2) Flat Head Cap Screws.
This accessory will not attach to the old style MPA BA Mounts. (The image shown on this item reflects the new style BA Mounts which are compatible).
This listing is only for the Cap Mounted Pic rail. The BA Mount is not included.