Aero Precision M4E1 Complete Upper .300 Blackout 10 Barrel EM-9 Gen 2 Handguard

Aero Precision M4E1 Complete Upper .300 Blackout 10 Barrel EM-9 Gen 2 Handguard Features: Aero Precision APAR640221M4: The upper receiver on this build is our state-of-the-art M4E1 platform. The M4E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. Through superior engineering we have condensed the parts needed to mount a free-floated handguard to a mere 8 screws. Since the handguard mounting surface and upper are of the same forging not only is it a stronger system but we are able to make additional lightning cuts to save weight and allow for more efficient cooling. The handguard that accompanies this upper is our Enhanced M-LOK (EM) Handguards provide a lightweight free float design for your custom AR15 build. The M-LOK system allows advanced modularity past the current 1913 Picatinny rail system. Machined to mil-spec dimensions and engineered to perfection this handguard eliminates bulk while retaining strength and stability. The barrel on this upper is our 10 .300 Blackout Pistol Barrel is the perfect addition to your AR15 build. Crafted to mil-spec standards from 4150 Chrome Moly Vanadium with a QPQ corrosion-resistant finish this barrel provides time-tested precision and accuracy for your AR15 .300 Blackout Pistol build. This upper does not come with a bolt carrier group or charging handle. Aero Precision M4E1 Complete Upper .300 Blackout 10 Barrel EM-9 Gen 2 Handguard Specifications: Caliber: .300 Blackout Barrel Length: 10 Barrel Material: 4150 Chrome Moly Vanadium Barrel Finish: QPQ Corrosion Resistant Gas System Length: Pistol Gas Block Journal: .750 Gas Port Size (inches): 0.0935 Barrel Rifling: 5R Twist Rate: 1:7 inches Thread Pitch: 5/8x24 Threaded Barrel Extension: M4 Weight: 21oz