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This Complete Upper includes our Quantum Handguard! Key features include the addition of built in anti-rotation tabs, removable 4-slot picatinny rail section for front sight and a 7 mounting surface for accessories.

Specifications for Aero Precision M4E1 Enhanced 10.5in 5.56 Barrel Quantum Handguard Complete Upper Receiver:
Finish: Anodized
Caliber: 5.56 NATO
Barrel Length: 10.5 in
Barrel Twist Rate: 1-7
Handguard Length: 9 in
Gun Type: AR-15
Weight: 43.04 oz
Features of Aero Precision M4E1 Enhanced 10.5in 5.56 Barrel Quantum Handguard Complete 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
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
Quantum Handguard Features:
1pc free float design
Removable 4-slot picatinny rail section for front sight
Built in anti-rotation tabs
7 mounting surfaces for KeyMod accessories
1.78in inside diameter fits most muzzle devices and 1.5in suppressors
Compatible with low profile gas blocks
10.5in 5.56 Barrel Features:
5.56 Nato 10.5in Barrel
1/7 twist
4150 CrMoV
gas port drilled
.750 gas block journal
Carbine length gas system
.0785 gas port
M4 Feed Ramp Extension
HP and MPI tested
Standard A2 flash hider
Included Accessories:
M4E1 Enhanced Assembled Upper Receiver
Quantum Handguard of choice
10.5in 5.56 CMV Barrel
Low Profile Gas Block and Carbine Length Gas Tube
Product comes assembled
This complete upper does not include BCG or Charging Handle
These products may be selected as add-ons under the FINISH YOUR BUILD tab
The muzzle brake that comes with this complete 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 16in as defined by the ATF for a rifle build.

Color: Black Additional Features: Quantum KeyMod Handguard
Code: 29D-UFH-M4E1E556105BQ-APAR640002P2

MPN: APAR640002P2

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