Next Level Armament AR15 450 Bushmaster 18in Forged Complete Upper Receiver 16in Carbine Gas 1-24 Twist Black. Whether you hunt deer or hogs the accuracy and stopping power of the Next Level NLX450 cannot be beat Because of the growing popularity of the 450 Bushmaster round we recognized many AR15 owners only needed a complete upper for hunting a few months of the year. We designed NLX450 Bushmaster complete upper with top quality components to meet that demand. Combined with the best 450 Bushmaster break design on the market we obtained incredible accuracy and range from a large caliber bullet. You wont be disappointed with your new hunting machine Specifications for Next Level Armament NLX450 AR15 450 Bushmaster 18in Forged Complete Upper Receiver: Manufacturer: Next Level Armament Caliber: .450 Bushmaster Barrel Length: 18 in Gas System Length: Carbine Length Barrel Twist Rate: 1-24 Muzzle Device: Compensator Finish: DLC Color: Black Fabric/Material: 7015 Aluminum Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Weight: 5 lb Magazine Included: No Package Contents: Next Level Armament NLX450 AR15 450 Bushmaster 18in Forged Complete Upper Receiver Tromix 18in Mid-Gas Or 16in Carbine Gas Nla Bolt Carrier W/ Dlc Finish Tromix .450Bm Bolt Nla556 Ambidextrous Charge Handle Nla Billet Low Profile Gas Block Nla 13in Mlok Handguard With 16in Barrel 15in Mlok Handguard With 18in Barrel Nla450 Bushmaster Brake Extra Power Buffer Spring What firearm models does the manufacturer say Next Level Armament NLX450 AR15 450 Bushmaster 18in Forged Complete Upper Receiver is compatible with? The manufacturer says that Next Level Armament NLX450 AR15 450 Bushmaster 18in Forged Complete Upper Receiver is compatible with AR-15Next Level Armament NLX507: AR15 450 Bushmaster 18in Forged Complete Upper Receiver 16in Carbine Gas 1-24 Twist Black