Aero Precision M4E1 Builder Set w/15" ATLAS S-ONE M-LOK Handguard - M81 Woodland Camo

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Aero Precision M4E1 Builder Set Includes:

  • 15″ ATLAS S-ONE M-LOK Handguard (M81 Woodland Cerakote)
  • M4E1 Threaded Upper Receiver (M81 Woodland Cerakote)
  • M4E1 Lower Receiver (M81 Woodland Cerakote)


The May Builder’s Sets feature an M81 Woodland Camo pattern that any true concealment connoisseur is sure to have in their collection. Republic Rifle’s custom designed pattern and color mixes are the closest to true Woodland you can find in Cerakote… If you see it at all.

Aero’s Builder Sets include the finished pieces that you’ll need to assemble your own M81 Woodland Camo M4E1 Rifle. Your Builder Set will contain an M4E1 Threaded Upper Receiver, M4E1 Lower Receiver, and Aero’s ATLAS S-ONE Handguard all finished in M81 Woodland Camo. Stand out at the range with a unique and eye catching build. The Monthly Builder sets are only offered for a limited time – once they are gone, they are gone!

Matching M81 Woodland Camo Magpul MOE Grip and SL-S Stock sold seperately HERE

M4E1 Lower Receiver Features:

  • Threaded Bolt Catch Roll Pin – Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included).
  • Integrated Trigger Guard – Eliminates the possibility of breaking the trigger guard tabs by integrating the trigger guard into the lower, creating a stronger more rigid platform to build upon.
  • Upper Tension Screw – Allows users to fine tune the fit of the upper and lower receiver using a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver.
  • Threaded Takedown Pin Detent Recess – Allows user to easily install the Takedown Pin detent and spring with the use of a 4-40 set screw (no more launching detents across the room).
  • Increased Magwell Flare – Increased the flare of the magwell to aid in quick and efficient magazine changes.

M4E1 Threaded Upper Receiver Features:

  • New enhanced forging that gives the upper receiver a “billet look”
  • New picatinny profile that blends seamlessly with Aero’s Enhanced and ATLAS Series Handguards
  • M4 Feedramps
  • .250 takedown pin holes
  • Lazer engraved T-marks


The newest addition to the Aero Precision Handguard lineup. Machined from 6061-T6 Aluminum, the S-ONE line of handguards are designed with size and weight in mind, providing the perfect handguard for your lightweight build.  Aero’s 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.

The new Aero Taper Lock Attachment System (ATLAS) is both functional and aesthetically pleasing. It features 2 mirrored tapered locking nuts that provide evenly distributed clamping pressure across a custom engineered barrel nut with use of a turnbuckle screw. A ratcheting detent further secures the design while providing positive registration during installation. By design, the even pressure of the ATLAS system avoids distortion of the handguard often seen with current applications during installation.


Additional Information Content

Modern Warriors

We started Modern Warriors for the sole purpose of providing a less expensive way to enjoy our love of buying and shooting some really cool stuff. What started as a hobby has turned into a business where we have developed the experience and ability to help you enjoy our same hobby and save you money in the process.

We specialize in tactical weapons, including suppressors, short barrel rifles and full auto weapons. We have routine experience in shooting the weapons we carry, so if you want our opinion on how a weapon operates, we will gladly provide it. We also have expertise working with licensed professionals in setting up gun trusts, which is an ideal way of purchasing, owning and operating any weapon restricted by the National Firearm Act. Don’t let the word “trust” scare you. It is very easy to set one up if you have the right help.

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