This is a Magpul Industries Sling Mount known as the SGA, model MAG507.
The SGA Receiver Sling Mount is a connection point for the Remington 870 SGA Shotgun Stock and one-point clip-in style attachments such as the MS3 Paraclip(TM)" the HK(R) hook" ITW(TM) MASH hook" and others. Made from precision cast steel that is Melonite(R) treated for wear and corrosion resistance. Dedicated fit for the Magpul SGA Stock" the Receiver Sling Mount can be installed on either the left or right side of the front of the stock. Made in U.S.A.
Features:
Solid steel construction
Configurable for left or right-side attachment
Connection point for the Remington 870 SGA shotgun stock
