The SA5 was designed and tested with professionals and protectors in mind. Turn your AR into a compact concealable platform with a folding stock adapter built to enhance your rifle. Made in the USA the SA5 is lightweight and 250% stronger than our 4th gen adapter. As with the Gen4 adapter choose from a left folding or right folding option depending on your needs. Built to work and built to last the SA5 is user-serviceable and easy to install. - Features: - AR15 Compatible - CNC-machined in the USA from 4140 Steel and only 9.4 ounces - Right or Left Fold Versions - Adjustable Hinge Tension - Improved and Hardened Buffer Pin - 2 QD attachment points - Improved Locking Mechanism - Standard 1-3/16 x 16 threading - Includes all tools needed for easy installation - Includes a 1045 Steel Bolt Extension - No additional parts are required for standard AR15 Bolt Carrier Groups - Installs in under 5 minutes. - Screw on fold and carry! - Compatibility Details - Compatible with .223/5.56 .308 300 Blackout and most 9mm ARs. - 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. - Does NOT work with Tippmann 22 or LWRC Pistols.