Grey Ghost Precision Complete Upper .300 Blackout 25.75in 16 inch 1-10 5/8x24 Heavy Pistol M-LOK Anodized Finish Black. 300 AAC Blackout has become a favorite among hunters due to its lack of recoil and relatively short overall length compared to other cartridges of the same bore size. Due to this many target shooters and varmint hunters will look to this cartridge for their hunting needs. We highly recommend this round to anyone in the market for a versatile round that can be easily mounted on a 16 inch barrel. We also recommend this round for anyone looking to build a lightweight .300 AAC Blackout upper to build your custom PCC combo. This upper makes an excellent single shot upper for your next build. Specifications for Grey Ghost Precision .300 AAC Blackout 16 inch Complete Upper: Manufacturer: Grey Ghost Precision Caliber: .300 AAC Blackout Overall Length: 25.75 in Barrel Length: 16 in Barrel Profile: Heavy Gas System Length: Pistol Length Barrel Twist Rate: 1-10 Threads per Inch: 5/8x24 Handguard Type: Drop-In Muzzle Device: Flash Hider Finish: Black Anodized Color: Black Fabric/Material: 7075-T651 Aluminum 6061-T6 Aluminum Handguard Length: 15 in Gun Rail: M-LOK Weight: 4.45 lb Magazine Included: No Mount Type: M-LOK Features of Grey Ghost Precision .300 AAC Blackout 16 inch Complete Upper GGP MKII 7075-T651 Billet Upper Receiver GGP MKII 15" M-LOK handguard True Black Type III Class 2 Mil Spec hard coat anodize 16in 300 blk barrel 1x10 twist 5/8x24 threaded muzzle Carbine length Gas GGP 30 cal Muzzle Brake Low-Profile Gas Block Bolt Carrier Group is Black Nitrided and MP/MPI tested Battle Arms Development RACK AR-15 Charging Handle No sights or optics included Package Contents: Grey Ghost Precision .300 AAC Blackout 16 inch Complete Upper Grey Ghost Precision GGP-300-16-UC: Complete Upper .300 Blackout 16 inch Anodized Finish Black