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Model Number
M4E1-T 223 Wylde 16" BBL Assembled Upper With Romeo5 Red Dot
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$599.99 $709.99
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223 Wylde
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Upper With Romeo5
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Brownells is offering the Aero Precision M4E1 with a choice of three different optics! We are offering this upper with the Eotech EXPS2-0, EXPS3-0, or the Sig Sauer Tango MSR 1-6x24mm Scope!

This assembled upper includes Aero Precision’s new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Their proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. Includes:

  • M4E1 Threaded Assembled Upper Receiver - Anodized Black
  • 15" ATLAS R-ONE M-LOK Handguard with 16"CMV Barrel OR
  • 15" ATLAS R-ONE M-LOK Handguard 18" Rifle Length CMV Barrel
  • Low Profile Gas Block and Mid Pencil, Mid-Length, or Rifle Length Gas Tube depending on configuration
  • Product comes assembled
  • This assembled upper does not include BCG or Charging Handle.

The muzzle brake 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.

M4E1 Threaded Upper Receiver Features:

  • New enhanced forging that gives the upper receiver a "billet look"
  • New picatinny profile that blends seamlessly with our Enhanced Series Handguards
  • M4 Feedramps
  • .250 takedown pin holes
  • Laser engraved T-marks
  • Includes port door and forward assist installed

ATLAS R-ONE Handguard Features:

  • Full top picatinny rail for optional attachments
  • Quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Compatible with low profile gas blocks
  • 1.3 Inside diameter
  • 1.5 Outside diameter
  • Compatible with mil-spec AR15 upper receivers and barrels

16" Mid-Length Barrel Features:

  • 16" Mid-length, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
  • .750 gas block journal
  • Mid-length gas system, .0785 gas port
  • M4 Feed Ramp Extension
  • HP and MPI tested
  • Standard A2 flash hider

When it comes to performance and precision, the EOTech® EXPS2-0 stands in a league of its own. Designed to meet the demands of tactical professionals and avid shooters alike, this holographic sight is the epitome of cutting-edge technology and rugged reliability.


Unparalleled Clarity: Experience crystal-clear optics and rapid target acquisition with the EXPS2-0. Its true holographic technology projects a precise reticle, ensuring that your point of aim and point of impact are always perfectly aligned. No more second-guessing your shots.

Quick and Easy Target Acquisition: The EXPS2-0 features a large, easy-to-see 68-MOA (Minute of Angle) circle with a precise 1-MOA dot at its center. This unique reticle design allows for rapid target acquisition, making it ideal for both close-quarters combat and long-range engagements.

Rock-Solid Durability: Built to withstand the harshest conditions, the EOTech® EXPS2-0 is constructed from aircraft-grade aluminum and is fully submersible in water up to 10 feet. Its compact, lightweight design ensures minimal impact on your weapon's balance and handling.

Tool-Free Mounting: With its quick-detach lever, mounting and dismounting the EXPS2-0 is a breeze, and it retains zero when reinstalled. No need for additional tools, ensuring you spend more time on the range and less time on setup.

Battery Life That Lasts: 1,000 continuous hours at nominal setting 12 at room temperature

Made in the USA: Rest assured knowing your EOTech® EXPS2-0 is proudly made in the United States, built to the highest quality standards in the industry.

Elevate your shooting experience with the EOTech® EXPS2-0 holographic sight. Whether you're a law enforcement officer, a competitive shooter, or a dedicated hunter, this sight will redefine your expectations of precision and reliability. Dominate the field with the EOTech® EXPS2-0—your ultimate tactical advantage.

Upgrade your optics today and experience the EOTech® difference.


  • Non-Night Vision Compatible
  • L X W X H: 3.8" x 2.3" x 2.9" (96.5 x 58.4 x 73.7 mm)
  • Weight: 11.2oz (317.5g)
  • Water Resistant: 10ft. (3 m) depth
  • Mount: 1" Weaver or MIL-STD-1913 rail
  • Windage & Elevation Adjustment: 0.5 MOA per click
  • Brightness: 20 daylight settings
  • Power Source: 1 x CR123 battery
  • Battery Life: 1,000 continuous hours at nominal setting 12 at room temperature
  • Operating Temperature: -40°F to 140°F (-40°C to 60°C)
  • Country of Origin: Made in USA

When it comes to rapid target acquisition, accuracy, and durability, the EOTech® HWS EXPS3-0 stands in a league of its own. Designed for the discerning marksman, this holographic weapon sight delivers a level of performance that's second to none.


Night Vision Compatible

Crystal Clear Optics: The EXPS3-0 features a state-of-the-art holographic reticle with an astounding 68 MOA circle and a precise 1 MOA dot, providing a clear and crisp sight picture that's parallax-free. Whether you're engaging targets up close or at a distance, you'll enjoy unparalleled clarity.

Enhanced Speed and Accuracy: With its advanced holographic technology, this optic allows for lightning-fast target acquisition. Simply place the reticle on your target, and you're ready to engage. The EXPS3-0 helps you stay on target, even in high-stress situations.

Unmatched Durability: Built like a tank, the EXPS3-0 is constructed from high-quality materials that are built to withstand the harshest conditions. It's waterproof, fogproof, and shockproof, ensuring reliable performance in any environment.

Quick Detach Mounting: Equipped with a quick-detach lever, the EXPS3-0 can be easily and securely mounted to any Picatinny or Weaver rail, allowing for quick removal and reinstallation without losing zero.

Efficient Power Management: SIDE BUTTON OPERATION featuring a side-mounted, easy-to-access control panel, you can adjust the brightness settings quickly. The EXPS3-0 also boasts an auto-shutdown feature to conserve battery life, giving you more time in the field.

Battle-Proven Performance: Trusted by military and law enforcement professionals worldwide, the EXPS3-0 has a proven track record of reliability and precision in high-stakes situations.

Upgrade Your Arsenal: For those who demand the best, the EOTech® HWS EXPS3-0 is the ultimate red dot sight, offering unmatched speed, accuracy, and ruggedness. Whether you're a competitive shooter or a tactical operator, this holographic weapon sight will elevate your performance to new heights.

Optical Specifications:

  • Magnification: 1x (no magnification).
  • Objective Lens Diameter: 30mm.
  • Reticle: Holographic with a 68 MOA circle and 1 MOA dot.
  • Parallax-free: Yes, at 100 yards.

Dimensions and Weight:

  • Length: Approximately 3.8 inches (97mm).
  • Width: Approximately 2.3 inches (58mm).
  • Height: Approximately 2.9 inches (73mm).
  • Weight: Approximately 11.2 ounces (317.5 grams).

Construction and Features:

  • Housing Material: Rugged aluminum housing.
  • Mounting: Quick-detach (QD) lever for easy attachment to Picatinny or Weaver rails.
  • Water Resistance: Water-resistant, not submersible.
  • Battery Life: Approximately 600 hours at a nominal setting.
  • Brightness Settings: Multiple brightness settings for different lighting conditions.
  • Night Vision Compatibility: Compatible with Gen I-III night vision devices.
  • Adjustment: Windage and elevation adjustments with 0.5 MOA clicks.
  • Power Source: One CR123 lithium battery.

Additional Information:

  • Field of View: Unlimited eye relief and field of view.
  • Mounting: Fits 1-inch Picatinny or Weaver rails.
  • Auto Shut-Off: Automatic shutdown after 8 hours to conserve battery life (programmable to 4 hours).



  • High Performance 6x optical system with low dispersion glass
  • Integrated thread in throw leaver for quick magnification changes
  • Illuminated MSR BDC-6 reticle with 11x brightness levels
  • Lay flat flip-back lens covers included
  • Dependable waterproof, shockproof, and fog-proof performance
  • Includes 1 piece aluminum cantilever mount

  • Magnification – 1-6x
  • Objective Size – 24mm
  • Focal Plane – Second
  • Click Value – ¼ MOA
  • Illuminated – Yes
  • Reticle – BDC6
  • Scope Tube Diameter – 30mm
  • Battery – CR-2032
  • Weight – 25 oz
  • OAL – 10.4”

Restricted Part
Please check with your state regulations for ownership of Restricted Parts. May require documentation.

Prop 65WARNING: Cancer & Reproductive Harm -

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