Buy it @ Brownells (Click Here)

A low-profile, left side-folding triangle design compatible with all platforms utilizing an M1913 (Picatinny) interface at the rear of the receiver. The TF1913TM is a complete assembly offering pull-through opening and a solid lock-up when extended.   

• Complete assembly, ready-to-install
• Advanced steel hinge design locks in both folded and extended positions
• Pull-through design offering quick deployment
• Rigid polymer substrate with flexible arm cuff
• Weight: 10.9oz
• Length: 9.5"
• Width (Max): 1"
• Strap Width: 1"
• Veteran designed
• Made in the USA