SABERTUBE DIRECT TO RECEIVER PISTOL Receiver ExtensionNOTE: THIS PRODUCT WILL NOT WORK WITH A STANDARD AR-15 RECEIVER UNLESS THE REAR TAKEDOWN PIN HOLE IS THREADED. THE USE OF A CAPTURED SPRING AND SCREW IS NECESSARY!*Gear Head Works Tailhook is not included. Includes: (1) SABERTUBE DIRECT TO RECEIVER *PISTOL* Receiver Extension/Buffer Tube COMPATIBLE WITH GEAR HEAD WORKS TAILHOOK MOD 1 with Stepped down OD (outside diameter) at end of the buffer tube Precision CNC from billet 6061 Aircraft Grade Aluminum Milspec Type III Class 2 Hard Anodized Black Unique, Lightweight and Functional Dimpled Pattern Design Milspec Carbine Buffer and Buffer Spring Compatible Perfect for the PISTOL AR Build. *NOT A STOCK* DIRECT TO RECEIVER: This product is perfect for those who have an AK, MPX, MCX or similar systems that do not have a need to capture a rear takedown spring via an end plate The lightweight design eliminated the need for Castle Nut Length Past Lower Receiver = 7 5/8in Made in the USA