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. - The Gen 4 AR Folding Adapter sits closer to your AR lower to reduce the length and any gaps. Turn your rifle into a foldable AR providing a compact rifle setup. - The direction of the fold is orientated to the direction as if your build was pointed down range. On a standard build Folding to the RIGHT folds toward the ejection port. Folding to the LEFT folds off to the side with out the ejection port. Our previous folders have folded off to the LEFT - Features: - Now Available as a left or right fold pick the best AR side folder setup to fit your needs. - Compatible with most AR15 - Standard 1-3/16 x 16 thread and does not require any additional parts to be used with standard AR15 Bolt Carrier Groups. - Compatible with JP Enterprise Silent Capture Buffer Spring right out of the box. - CNC-machined in the USA from 7075 Billet Aluminum making it uniquely lightweight and corrosion-resistant. This assembly weighs only 6.0 ounces. - The included wrench makes for a quick and easy install. The product does not need to be disassembled in order to install it onto your rifle/pistol. - Simply screw on fold and carry! - Product Details - Includes a .625 Aluminum Bolt Extension compatible with the JP silent capture spring - Includes a castle nut wrench - Fit: Platforms .223/5.56 to .308 & Most 9mm - Does NOT work with Tippmann 22 or LWRC Pistols - Some 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 - Now Compatible with Silent Capture Buffer Springs. (Does NOT work with Armaspec Silent Capture) - Compatible with your 300 Blackout AR