R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit Socom 1-10 Twist 1/2x36 Comp/Brake Hybrid Black. The kit consists of: Billet upper receiver proprietary to the design. 6" handguard with forward charging assembly 5.5" 9mm barrel with 1/2-36 threaded muzzle device. Patented 9mm Bolt Carrier Group with recoil spring proprietary to the design Recoil Brake assembly and end cap proprietary to the design (This attachment replaces the need for a standard buffer tube buffer and spring) These AR15 Upper Receivers are compatible with 9mm Glock Colt MP5 and Scorpion style AR lowers. Specifications for R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit: Manufacturer: R&D Precision Overall Length: 16 in Barrel Length: 5 in Barrel Profile: SOCOM Barrel Twist Rate: 1-10 Threads per Inch: 1/2x36 Muzzle Device: R&D Flash Hider w/ 1/2-36 Thread Finish: Hard Anodized Aluminum Color: Black Fabric/Material: Aluminum/Steel Handguard Length: 6 in Handguard Style: Hybrid Rail Gun Rail: Picatinny Gun Make: Colt Glock Gun Model: AR-9 Weight: 0.6 lb Condition: New Barrel Material: 4140 Chrome Moly Bolt Carrier Group Included: MIL-SPEC Magazine Included: No Charging Handle Included: MIL-SPEC Projectile Caliber: .355 Caliber Features of R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit Compatible with Colt Glock MP5 and Scorpion pattern lowers. Non-recipricating ambidextrous forward charging handle. Patented "bufferless" design completely elimanates the need for the buffer tube and assembly. Endcap has picatinny rail for mounting a brace. 3 QD points for multiple strap and mount options Package Contents: R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit What firearm models does the manufacturer say R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit is compatible with? The manufacturer suggests that R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit is compatible with AR-9R&D Precision RD8292PW91: PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit Socom 1-10 Twist 1/2x36 Comp/Brake Hybrid Black