Sylvan Arms SA5 Pro Features The Sylvan Arms SA5 Pro folding stock adapter is CNC-machined in the USA from 4140 steel delivering 250% more strength than the company s previous generation adapter while adding only 9.4 ounces to the rifle. This right-fold version orients toward the ejection port when the rifle is pointed downrange folding the stock to dramatically reduce overall length for compact storage or transport. An adjustable hinge tension setting and improved hardened buffer pin let owners fine-tune the fold action to their preference. Two QD attachment points add sling mounting options directly on the adapter. Installation uses the standard 1-3/16 inch by 16 threading found on most AR15 receiver extensions and the kit includes all tools needed for a install completed in under five minutes. A 1045 steel bolt extension is included and no additional parts are required for standard AR15 bolt carrier groups. The adapter is compatible with .223/5.56 .308 .300 Blackout and most 9mm AR builds though it does not work with Tippmann 22 or LWRC pistols. An improved locking mechanism keeps the stock secure once folded or extended giving shooters confidence in the adapter s reliability. Sylvan Arms SA5 Pro Specifications Brand: Sylvan Arms Model: SA5 Pro Type: Folding Stock Adapter Compatible Hosts: AR-15 AR9 .308 .300 Blackout Material: 4140 Steel Color: Black Thread Pattern: 1-3/16 x 16 Weight: 9.4 oz Includes: Bolt Extension Castle Nut Wrench Available At: GrabAGun