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Product Discontinued by Manufacturer
Aero Precision M4E1 18in 5.56 Enhanced Complete Upper Receiver with Flash Hider has been discontinued by Aero Precision and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Gun Parts, AR 15 Parts, Rifle Parts, AR15 Upper Receivers yourself to try and find the perfect replacement for you!
ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.
Product Info for Aero Precision M4E1 18in 5.56 Enhanced Complete Upper Receiver with Flash Hider
This Complete Upper includes Aero Precision's 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.![]()
Features of Aero Precision M4E1 18in 5.56 Enhanced Complete Upper Receiver with Flash Hider
- 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
- 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
- 18in 5.56 Rifle Length Barrel Features:
- 5.56 Nato 18in 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
- Included Accessories:
- M4E1 Enhanced Assembled Upper Receiver
- Enhanced Handguard of choice
- 18in 5.56 Rifle Length CMV Barrel
- Low Profile Gas Block and Rifle 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
Ammunition




Related Products to Aero Precision M4E1 18in 5.56 Enhanced Complete Upper Receiver with Flash Hider
Aero Precision M4E1 18in 5.56 Enhanced Complete Upper Receiver with Flash Hider Unavailable & Discontinued Models
List of Unorderable Models
- Aero Precision Complete Upper Receiver, M4E1-E, 18in, 5.56 Rifle Barrel, Quantum 15in M-LOK Handguard, Anodized Black, APAR640105M8 , MPN: APAR640105M8 , Code: 29D-UFH-M4E1E55618RLQ-APAR640105M8
- DEMO, Aero Precision Complete Upper Receiver, M4E1-E, 18in, 5.56 Rifle Barrel, Quantum 15in M-LOK Handguard, Flat Dark Earth, APAR640115M8 , MPN: APAR640115M8-DEMO , Code: 29D-UFH-M4E1E55618RLQ-APAR640115M8-DEMO
- Aero Precision Complete Upper Receiver, M4E1-E, 18in, 5.56 Rifle Barrel, Quantum 15in KeyMod Handguard, Anodized Black, APAR640005P8 , MPN: APAR640005P8 , Code: 29D-UFH-M4E1E55618RLQ-APAR640005P8
- Aero Precision Complete Upper Receiver, M4E1-E, 18in, 5.56 Rifle Barrel, Quantum 15in M-LOK Handguard, Flat Dark Earth, APAR640115M8 , MPN: APAR640115M8 , Code: 29D-UFH-M4E1E55618RLQ-APAR640115M8
- Aero Precision Complete Upper Receiver, M4E1-E, 18in, 5.56 Rifle Barrel, Quantum 15in KeyMod Handguard, Flat Dark Earth, APAR640015P8 , MPN: APAR640015P8 , Code: 29D-UFH-M4E1E55618RLQ-APAR640015P8



































































































































































































