AR15 M4E1 Build W/ BA Govt 16″ 556 Nato 1/7 Twist – 15″ Atlas R-One M-Lok

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SKU: BKING-16-556-ATLAS-R-ONE-15 Categories: ,



This product is 100% Made in the USA! Our gas tubes, gas blocks and even roll pins are all proudly manufactured in the US.


  • Aero Precision M4E1 Threaded Assembled Upper Receiver
  • Aero Precision Atlas R-One  15″ M-LOK Handguard
  • Ballistic Advantage 16″ 556 NATO Mid Length Government Profile QPQ corrosion resistant Barrel 1/7 Twist
  • Low Profile Gas Block and Mid Length Gas Tube
  • A2 Flash Hider
  • Product comes assembled
  • No BCG or Charging Handle 

M4E1 Threaded Upper Features:

The M4E1 Threaded Upper Receiver features a new angular machined design that helps it stand apart from standard mil-spec upper receivers. This upper receiver features the same enhanced body profile as our M4E1 Enhanced Upper Receiver but is threaded to accept a standard AR15 barrel nut. It is forged from 7075-T6 Aluminum, precision machined to work with all mil-spec AR15 parts and includes the port door and forward assist pre-installed.

The M4E1 Threaded Upper Receiver is designed to pair perfectly with our new M4E1 Lower Receiver, giving you a billet looking receiver set at a fraction of the billet price.


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

Atlas R-ONE Description

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

Lightweight By Design

  • M-LOK Handguard Weights: 15″ –9.07 oz
  • Mounting Hardware Weight: 4.72 oz (same across all ATLAS Handguard options)


  • 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

Ballistic Advantage 16″ 5.56 Government Profile Mid Length AR 15 Barrel, Modern Series Features:

This 5.56 chambered 16 inch Government Profile Mid Length Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. These barrels have a sub MOA Accuracy Guarantee!!!

Additional Info

Length – 16″

Material – 4150 Chrome Moly Vanadium

Profile – Government

Finish – QPQ Corrosion Resistant

Gas System Length – Mid

Gas Block Journal – .750″

Twist Rate – 1:7 inches

Muzzle – 1/2×28 Threaded

Weight – 27oz

Additional information

Weight 3 lbs
Dimensions 28 × 4 × 4 in