Strike Industries Pit Stock Use w/SI 7-Position Advanced Receiver Extension Black One Size. Its time to rethink what a stock can do. Its time to reject the status quo the compromises they all have taken for what is rather than think about what can be. The AR as a compact platform has always felt like an amalgamation of ad hoc fixes rather than a dedicated system of components designed from the ground up to work in harmony with Specifications for Strike Industries Pit Stock: Manufacturer: Strike Industries Gun Model: AR-15 Gun Type: Rifle Weight: 4 oz Length: 2.68 in Additional Features: Only Compatible w/ SI Receiver Extension SI-AR-ARE-T7 Condition: New Buffer Tube Size: Mil-Spec Fabric/Material: 6061-T6 Aluminum Features of Strike Industries Pit Stock 2 in 1 adjustable or fixed 3 Position Adjustable Lighter than a milspec m4 stock but 2x more durable. Skeletonized and lowprofile design ideal for lightweight builds and shortbarreled firearms. Package Contents: Strike Industries Pit Stock 1x Pit Stock Assembly 1x Fixed Position Mounting Screw 2x Rubber sliders What firearm models does the manufacturer say Strike Industries Pit Stock is compatible with? The manufacturer says that Strike Industries Pit Stock is compatible with AR-15Strike Industries SI-STRIKE-PIT-BK: Pit Stock Use w/SI 7-Position Advanced Receiver Extension Black One Size