From Aero Precision, the AR-15 M4E1 .300 Blackout Assembled Upper Receivers. Chambered in 300 Blackout, the upper is finished with black anodizing and available in three lengths, each with different length handguards. This upper does not come with the charging handle or bolt carrier group, allowing the user to personalize their upper receiver even more!

The Aero Precision AR-15 8", 10", or 16” Assembled Upper Receiver is a great choice for your next AR-15 build!

FEATURES:

• M-LOK EM-7 7” for 8” barrel, 9” handguard for 10” barrel, 15” handguard for 16” barrel
• 8”, 10”, or 16” chrome moly barrel
• Pistol length gas system w/ low profile gas block
• Standard A2 flash hider - not pinned or welded
• Made in the USA

NOTE: Bolt Carrier Group and Charging Handle are NOT included.

8" .300 BLACKOUT BARREL FEATURES:

• Length: 8"
• Twist: 1 in 7
• Muzzle: 5/8x24 Threaded
• Material: 4150 Crome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas Port: .109
• Gas System Length: Pistol
• Weight: 18oz
• M4 Barrel Extension
• HP and MPI Tested

10" .300 BLACKOUT BARREL FEATURES:

• Length: 10"
• Twist: 1 in 7
• Muzzle: 5/8x24 Threaded
• Material: 4150 Crome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas Port: .0935
• Gas System Length: Pistol
• Weight: 21oz
• M4 Barrel Extension
• HP and MPI Tested

• Length: 16"
• Material: 4150 Chome Moly Vanadium
• Finish: QPQ Corrosion Resistant Finish
• Gas System Length: Pistol
• Gas Block Journal: .750"
• Twist Rate: 1:7 Inches
• Muzzle: 5/8x24 Threaded
• Weight: 29oz
• Other; M4 Feed Ramp Extension, HP and MPI Tested, Standard A2 Flash Hider

The flash hider that comes with this assembled upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16" as defined by the ATF for a rifle build.