Spikes Tactical Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/12in M-LOK Rail w/ Dynacomp. 56 Midlength Lightweight Forged 14.5in Upper Receiver. These AR15 Upper Receivers brought to you by Spikes Tactical are crated from 7075 T6 aluminum that's rugged as can be without adding significant weight to your firearm. To keep your firearm functioning properly the Spikes Tactical 5.56 Midlength Lightweight 14.5in Rifle Upper Receiver contains a solid billet steel gas block as well as a nitride-coated gas tube. Each barrel is chrome-lined and phosphate coated for maximum performance and superior resistance to corrosive elements. Find the best Spikes Tactical 5.56 Midlength Lightweight 14.5in Drop-In Upper Receiver for your shooting style and enjoy the significant upgrade of high quality parts that deliver with every shot. Specifications for Spikes Tactical 5.56 Midlength Lightweight Forged 14.5in Upper Receiver: Manufacturer: Spikes Tactical Caliber: 5.56x45mm NATO Overall Length: 16 in Barrel Length: 14.5 in Gas System Length: Mid Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 1/2x28 Muzzle Device: Dynacomp Finish: Anodized Color: Black Fabric/Material: 7075-T6 Aluminum Gun Model: AR-15 Condition: New Barrel Material: 4150 Chrome Moly Vanadium Bolt Carrier Group Included: MIL-SPEC Magazine Included: No Charging Handle Included: MIL-SPEC Country of Origin: USA Features of Spikes Tactical 5.56 Midlength Lightweight Forged 14.5in Upper Receiver: Forged Upper Receiver 7075 T6 Construction Forward Assist Ejection Port Door Ejection Port Door Spring Ejection Port Door Rod 14.5" Mid Length Lightweight Barrel MIL-B-11595E CMV Chrome Lined 1/7 Twist Rate 1/2 X 28 Thread Pitch for Muzzle 5.56 Nato Chamber .625 Gas Block Seat M4 Feed Ramped Barrel Extension Mil-Spec Phosphate Coating Low Profile Gas Block Solid Billet Steel .625 I.D. Mid Length Gas Tube Black Nitride Inside and Out Gas Tube Roll Pin Charging Handle Forged Aluminum Mil-Spec Type 3 Coating Phosphate M16 Complete BCG Phosphate Coated Laser Engraved with ST Spider logo High Pressure Tested (HPT) Magnetic Particle Inspected (MPI) Dynacomp Muzzle Device Pin and Welded (16" OAL) Package Contents: Spikes Tactical 5.56 Midlength Lightweight Forged 14.5in Upper Receiver What firearm models does the manufacturer say Spikes Tactical 5.56 Midlength Lightweight Forged 14.5in Upper Receiver is compatible with? The manufacturer says that Spikes Tactical 5.56 Midlength Lightweight Forged 14.5in Upper Receiver is compatible with AR-15Spikes Tactical STU5050-CM2D: Upper 5.56 14.5in 16in OAL Midlength Lightweight LE w/12in M-LOK Rail w/ Dynacomp