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New! Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver APAR640251Q7 Caliber: 5.56x45mm NATO, Overall Length: 26 in, $65.01 Off w/ Free S&H

Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
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Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
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Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
3 of 8 images
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
4 of 8 images
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
5 of 8 images
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
6 of 8 images
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
7 of 8 images
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7
8 of 8 images
Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7

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Questions & Answers

New Product

See more new Aero Precision Gun Parts items
We’ve just added this new product to OpticsPlanet. Be the first to get it!
Caliber:
5.56x45mm NATO
Overall Length:
26 in
Barrel Length:
16 in
Barrel Profile:
Government
Gas System Length:
Mid Length
Barrel Twist Rate:
1-7
Firearms Threads Per Inch:
1/2x28
Handguard Type:
Free-Float
Muzzle Device:
A2 Flash Hider
Finish:
Anodized
Color:
Black
Gun Model:
AR-15, M16
Handguard Length:
15 in
Barrel Material:
4150 Chrome Moly Vanadium
Weight:
48.5 oz
Condition:
New

Code: 29D-UFH-M4E1MSAD-APAR600251Q7

MPN: APAR640251Q7

UPC: 815421023435

List: $655.00Save 10%
$589.99

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.

made-in-usa-flag Made in USA

Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver

This Complete Upper includes our Gen 2 Enhanced Handguard! 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.image

Specifications for Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver:

Manufacturer: Aero Precision
Caliber: 5.56x45mm NATO
Overall Length: 26 in
Barrel Length: 16 in
Barrel Profile: Government
Gas System Length: Mid Length
Barrel Twist Rate: 1-7
Firearms Threads Per Inch: 1/2x28
Handguard Type: Free-Float
Muzzle Device: A2 Flash Hider
Finish: Anodized
Color: Black
Gun Model: M16, AR-15
Fabric/Material: 7075-T6 forged aluminum, 4150 Chrome Moly Vanadium
Attachment Type: Picatinny
Handguard Length: 15 in
Handguard Style: Quad Rail
Gun Rail: Picatinny
Gun Type: Rifle
Gun Make: Aero Precision, AR Platform
Barrel Material: 4150 Chrome Moly Vanadium
Gas Block Journal Size-Length: 0.75 in
Weight: 48.5 oz
Bolt Carrier Group Included: No
Charging Handle Included: No
Magazine Included: No
Condition: New
Mount Type: Picatinny
Threads per Inch: 1/2x28
Country of Origin: USA

Features of Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in 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
  • Gen 2 Enhanced Handguard Features:
  • 1pc free float design
  • 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
  • 16" 5.56 Mid-Length Barrel Features:
  • 5.56 Nato 16" Midlength, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Midlength gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

Package Contents:

  • Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver
  • M4E1 Enhanced Assembled Upper Receiver
  • Enhanced Handguard of choice
  • 16" 5.56 Mid-Length CMV Barrel
  • Low Profile Gas Block and Mid Length Gas Tube
  • Product comes assembled

What firearm models does the manufacturer say Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver is compatible with?

The manufacturer suggests that Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver is compatible with AR-15, M16

Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver Orderable Models

List of Orderable Models

  • Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 15in Quad Rail Handguard, No BCG/CH, Anodized, Black, APAR640251Q7 , MPN: APAR640251Q7 , UPC: 815421023435 , Code: 29D-UFH-M4E1MSAD-APAR600251Q7

Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in Picatinny Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • Aero Precision M4E1, AR-15, 5.56x45mm NATO, 16in, Picatinny Upper Receiver, Mid Length Barrel, 1-7 Twist, 1/2x28, A2 Flash Hider, 12in Quad Rail Handguard, Cerakote, Flat Dark Earth, APAR640232Q7 , MPN: APAR640232Q7 , UPC: 815421023268 , Code: 29D-UFH-M4E1MSAD-APAR600232Q7
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Last updated 2026-07-07 UTC.