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. Specifications for Sylvan Arms AR15 Gen 4 Folding Stock Adapter: Manufacturer: Sylvan Arms Condition: New Color: Black Features of Sylvan Arms AR15 Gen 4 Folding Stock Adapter Now Available as a left or right fold, pick the best AR side folder setup to fit your needs. Compatible with most AR15s and some AR9s or AR10s. (Some AR9 BCGs are not compatible.) 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 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 ARs for an effortless 300 Blackout Folding Stock Setup. If your bolt carrier group is causing the bolt extension to come up short contact us for a conversion.  Includes all items needed to install. Package Contents: Sylvan Arms AR15 Gen 4 Folding Stock Adapter