A3 Industries Rear Stock Adapter for B&T APC 6061 T6 Aluminum Picatinny Black. This stock adapter has a Picatinny rail to adapt any side folding stock (or arm brace) designed for Picatinny mounting. The bolt pattern and locating lug on the rear of the adapter provides a positive modular mounting platform for a wide variety of braces and stocks. NOTE: Currently fits pistol caliber APC's only. Specifications for A3 Industries Rear Stock Adapter for B&T APC: Manufacturer: A3 Industries Color: Black Gun Make: Brugger & Thomet Gun Model: Brugger & Thomet APC9 Gun Type: Carbine Fabric/Material: 6061-T6 Aluminum Finish: Type II Low Gloss Anodized Features of A3 Industries Rear Stock Adapter for B&T APC Retains original B&T hydraulic buffer Steel QD sling socket on base of adapter No modifications to firearm needed Modular design for various cross-platform use Large #10 threads and positive lug for increased mount stability Package Contents: A3 Industries Rear Stock Adapter for B&T APC What firearm models does the manufacturer say A3 Industries Rear Stock Adapter for B&T APC is compatible with? The manufacturer says that A3 Industries Rear Stock Adapter for B&T APC is compatible with Brugger & Thomet APC9A3 Industries RSA002: Rear Stock Adapter for B&T APC 6061 T6 Aluminum Picatinny Black