Aero Precision M4E1 5.56mm NATO 18in Picatinny Upper Receiver Rifle Length 1-7 Twist 1/2×28 Anodized Black

Aero Precision M4E1 5.56mm NATO 18in Picatinny Upper Receiver Rifle Length 1-7 Twist 1/2×28 Anodized Black. Key features include the addition of quick disconnect sling sockets enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail. Specifications for Aero Precision M4E1 AR-15 5.56mm NATO 18in Picatinny Upper Receiver: Manufacturer: Aero Precision Caliber: 5.56x45mm NATO Barrel Length: 18 in Barrel Profile: SPR Gas System Length: Rifle Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 1/2×28 Handguard Type: Free-Float Muzzle Device: A2 Flash Hider Finish: Anodized Color: Black Gun Model: AR-15 M16 Fabric/Material: 7075 T6 Aluminum 7075-T6 Aluminum Attachment Type: Picatinny Gas Block Journal Size-Diameter: .750 in Handguard Length: 15 in Gun Rail: Quad Rail Picatinny Gun Type: Rifle Gun Make: AR Platform Aero Precision Barrel Material: 4150 Chrome Moly Vanadium Gas Block Journal Size-Length: 0.75 in Weight: 68.5 oz Bolt Carrier Group Included: No Charging Handle Included: No Magazine Included: No Condition: New Mount Type: Picatinny Threads per Inch: 1/2×28 Country of Origin: USA Features of Aero Precision M4E1 AR-15 5.56mm NATO 18in Picatinny Upper Receiver: M4E1 Enhanced Assembled Upper Receiver Enhanced Handguard of choice 18″ 5.56 Rifle Length CMV Barrel Low Profile Gas Block and Rifle Length Gas Tube Product comes assembled Package Contents: Aero Precision M4E1 AR-15 5.56mm NATO 18in Picatinny Upper Receiver M4E1 Upper Features: Forged from 7075 T6 aluminum Precision machined to M4E1 specs M4 feedramps Matte black hard coat anodized Mil 8625 Type 3 Class 2 Laser engraved T-marks (Anodized only) Comes assembled with port door and forward assist installed Accepts standard AR15/M16 components Handguard mounting platform is forged into the receiver Works with Aero Precision handguards but also fits most BAR-system handguards Barrel nut and wrench are included Enhanced Handguard Features: 1pc free float design Rail is Machined from 6061-T6 Aluminum Built in Anti-Rotation tabs Scalloped rails Continuous top rail 1.78″ inside diameter fits most muzzle devices and 1.5″ suppressors Compatible with low profile gas blocks Gen 2 Feature – Quick disconnect sling socket at the 3 6 and 9 o’clock positions Gen 2 Feature – Additional milling along flats to aid with gripping and add visual appeal Gen 2 Feature – New profile for the continuous picatinny top rail 18″ 5.56 Rifle Length Barrel Features: 5.56 Nato 18″ Rifle Length Barrel 4150 CrMoV w/ QPQ finish 1/7 twist .750 gas block journal Rifle length gas system M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider What firearm models does the manufacturer say Aero Precision M4E1 AR-15 5.56mm NATO 18in Picatinny Upper Receiver is compatible with? The manufacturer suggests that Aero Precision M4E1 AR-15 5.56mm NATO 18in Picatinny Upper Receiver is compatible with AR-15 M16Aero Precision APAR640251Q8: M4E1 Complete Upper Receiver AR-15 18 in Rifle Length Barrel 15 in Quad Rail Handguard No BCH/CH Anodized Black