KynSHOT AR-15 Adjustable Shotgun Recoil Buffer Black. The KynSHOT RB5100 is a shock absorber designed to be used as the stock tube on shotguns that have AR-15 stock adapters. The KynSHOT RB5100 can mount to any mil-spec collapsible stock. The unit will compress up to 3/4in as the shotgun recoils. This is the most effective type of recoil reducer you can put on a shotgun and provides dramatic recoil reduction. Specifications for KynSHOT AR-15 Adjustable Shotgun Recoil Buffer: Manufacturer: KynSHOT Color: Black Gun Make: AR Platform Gun Model: AR-15 Length: 8.05 in Weight: 13.5 oz Condition: New Country of Origin: USA Caliber: 12 Gauge 20 Gauge Gun Type: Shotgun Rifle Features of KynSHOT AR-15 Adjustable Shotgun Recoil Buffer Recoil reduction up to 90percent Adjustable to fit user's feel and load Accepts any mil-spec AR-15 butt stock Speeds shot recovery Military grade materials and manufacturing Package Contents: KynSHOT AR-15 Adjustable Shotgun Recoil Buffer What firearm models does the manufacturer say KynSHOT AR-15 Adjustable Shotgun Recoil Buffer is compatible with? The manufacturer suggests that KynSHOT AR-15 Adjustable Shotgun Recoil Buffer is compatible with AR-15KynSHOT RB5100: AR-15 Adjustable Shotgun Recoil Buffer Black