AR15 and AR9 Folding Stock Adapter Gen. 3 - Cosmetically Blemished - Our refurbished Folding Stock Adapters may have cosmetic blemishes but do not affect the use or function of the product. They are still under our Limited Lifetime Warranty. The Sylvan Arms Folding Stock Adapter allows you to fold your stock and significantly reduce the length of your rifle for easy stow and travel. Specifically designed for gas piston and direct impingement systems .223 / 5.56 to .308 systems, it has standard 1-3/16" x 16 thread and does not require any additional parts to be used with standard Bolt Carrier Groups. It is CNC-machined in the USA from 7075 Billet Aluminum, making it uniquely lightweight and corrosion-resistant. This assembly weighs only 6.0 ounces. No special tools are required; only a standard armorer's wrench. The product does not need to be disassembled in order to install it onto your rifle/pistol. Simply screw on, fold and carry! Now Compatible with Silent Capture Buffer Springs! Click Here for our Silent Capture Bolt Extension! Product Details Includes standard .625 Aluminum Bolt Extension Fit: Platforms .223/5.56 to .308 & Most 9mm Does NOT work with Tippmann 22 or LWRC Pistols 9mm bolt carriers with standard sizing, 5/8 ID (.625) can use the included bolt extension after removing the pin and weight from the back of the BCG For smaller diameter BCGs, we have 17/32 .531 bolt extensions available here Now Compatible with Silent Capture Buffer Springs if you use our Silent Capture Bolt Extension (Does NOT work with Armaspec Silent Capture) 300 blk (blackout) compatible Adds 2 inches to length of pull If your bolt carrier group is causing the bolt extension to come up short contact us for a conversion We recommend purchasing a Buffer Retaining Nut to replace the pin. Specifications Finish: Hard Coat Black Anodized Material: 7075 CNC-machined billet Aluminum Thread specifications: 1-3/16" X 16 Hinge dimensions: 3 11/16 inches Hinge eight: 6.0 oz. Bolt Extension: 1.1 oz. Hinge length: 1.3 inches Warranty: limited lifetime Designed, built and assembled in the USA ***Coupon codes are NOT valid for this product***