Sniper Mil-Spec AR-15 Adjustable Buttstock Commercial Spec QR Sling Swivel Adapter Polymer Black. Constructed with premium quality polymer. Durable and versatile can attach to either rifle or carbine length tubes. Specifications for Sniper AR-15 Adjustable Buttstocks: Manufacturer: Sniper Color: Black Gun Model: AR-15 Gun Type: Rifle Condition: New Buffer Tube Size: Commercial Fabric/Material: Polymer Features of Sniper AR-15 Adjustable Buttstock Commercial size buffer tube (1.17" OD). Package Contents: Sniper AR-15 Adjustable Buttstock Also comes with Adjuster lock screw to make CA compliant. Quick detachable metal sling swivel and hex wrench included. What firearm models does the manufacturer say Sniper AR-15 Adjustable Buttstocks is compatible with? The manufacturer says that Sniper AR-15 Adjustable Buttstocks is compatible with AR-15Sniper AAST05: Mil-Spec AR-15 Adjustable Buttstock Commercial Spec QR Sling Swivel Adapter Polymer Black