Tiger Rock AR Rifle Kit Handguard 7.62x39 16in Barrel HBAR Carbine 1x10 Twist 5/8x24 Thread 10in Quad Rail Handguard Brake Nitride Anodized Black. All parts are made to mil-spec standards. No Lower Receiver Included. Specifications for Tiger Rock 7.62x39 AR Rifle Kit: Manufacturer: Tiger Rock Caliber: 7.62x39mm Overall Length: 16 in Barrel Length: 16 in Barrel Profile: Carbine Gas System Length: Carbine Length Barrel Twist Rate: 1-10 Threads per Inch: 5/8x24 Handguard Type: Free-Float Muzzle Device: A2 Flash Hider Finish: Nitrite Color: Black Fabric/Material: 7075 T6 Aluminum Gas Block Journal Size-Diameter: .750 in Handguard Length: 10 in Gun Rail: Quad Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Weight: 2.2 oz Barrel Material: 4150 Chrome Moly Vanadium Magazine Included: No Mount Type: Picatinny Features of Tiger Rock 7.62x39 AR Rifle Kit: Kit shown assemble to display finished product Kit does not come assembled Kit cannot be changed no modifications will be accepted This is NOT a FFL item Package Contents: Tiger Rock 7.62x39 AR Rifle Kit 7.62x39 16in Carbine Length Barrel 1:10 Twist Parkerized Finish AR 7.62x39 Bolt Carrier Group- Black Nitride AR-15 Stripped Upper Receiver AR-15 Tactical Charging Handle Assembly AR-15 Ejection Port Dust Cover Complete Assembly AR-15 Forward Assist AR-15 / AR-10 Carbine Length Gas Tube 9.75in -Stainless Steel .750 Low Profile Steel Gas Block with Roll Pins and Wrench -Black AR-15 10in Mid Length Free Float Quad Rail w/ Barrel Nut AR-15 M4 Six Position Buffer Tube Kit -Mil-Spec AR-15 Collapsible Standard Version Stock Body-Mil Spec AR-10 Steel Crush Washer 5/8x24 308 Birdcage Muzzle Brake for 5/8inx24 Pitch - 5 Ports Lower Parts Kit w/ Standard Grip and Trigger Guard What firearm models does the manufacturer say Tiger Rock 7.62x39 AR Rifle Kit is compatible with? The manufacturer says that Tiger Rock 7.62x39 AR Rifle Kit is compatible with AR-15Tiger Rock 762-AR: AR Rifle Kit Handguard 7.62x39 16in Barrel HBAR Carbine 1x10 Twist 5/8x24 Thread 10in Quad Rail Handguard Brake Nitride Anodized Black