If your firearm doesn't already have a 1913 attachment rail on the rear choose the appropriate adapter. 8-inch Armbar, Brace Adapter, JMac 1913 Folding Mech - not assembled

• Lightweight and Rigid Modular Design –
• Brace/Stock with many mounting options
• Integrated QD Sling Socket 8"" Length
• 7075 T6 Aluminum Hard-Coat Anodized.
• This adapter mounts to the end of our AB (Arm Bar) and allows you to install braces like the TailHook from Gear Head Works.
• Anti-Rotational design
• 7075 T6 Aluminum
• Type 3 Hard-coat Anodize.

Includes:

• Arm Bar-Brace Adatper Socket Head Screw
• Arm Bar-Brace Adapter Anti-Rotation Pin
• JMac 1913 folding mechanism.