Aero Precision Gen 2 Builder Set W/ 15″ Enhanced Gen 2 M-LOK

(7 customer reviews)

$314.99 $240.00

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Our AR15 Gen 2 Stripped Lower Receiver is the perfect base for your custom AR15 build. Machined to mil-spec dimensions, our lowers work with standard AR15 components and ensure the highest quality with a correct component interface.

Gen 2 Improvements

  • Upper Tension Screw – Allows users to fine tune the fit of the upper and lower receiver through the use of 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.
  • Increased Magwell Flare – Allows for easier insertion of magazines and provides a sleeker look.


  • Matte black hard-coat anodized Mil 8625 Type 3 Class 2
  • Machined from 7075-T6 billet aluminum
  • Works with standard AR15  components
  • Now includes hard engraved Aero Precision “A” Logo
  • Includes 3 button head screws for a clean installation. No roll pins needed.

Our state-of-the-art Enhanced Upper Receiver combines the handguard mounting platform with the upper itself, condensing the parts needed to mount a free-floated handguard to a mere 8 screws.

M4E1 Specific Details:

  • 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
  • These uppers are not piston-kit compatible


  • M4 Feedramps
  • .250 takedown pin holes
  • Lazer engraved T-marks
  • Comes assembled, with dust cover and forward assist installed


  • AR15 M4E1 Upper Receiver in Anodized Black
  • Port Door and Forward Assist installed
  • Barrel nut
  • Barrel nut wrench

Gen 2 Enhanced Handguard Features:

  • 1pc free float design
  • Built in anti-rotation tabs
  • Scalloped rails
  • Continuous top rail
  • 1.72″ 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


  • Stripped AR15 Lower Receiver, Gen 2
  • Nylon tipped tensioning set screw
  • AR15 M4E1 Enhanced Upper Receiver Assembled with Barrel Nut Wrench
  • Enhanced 15″ Gen 2 M-LOK Handguard
  • Handguard mounting screws

Additional information

Weight 5 lbs
Dimensions 20 × 8 × 4 in

7 reviews for Aero Precision Gen 2 Builder Set W/ 15″ Enhanced Gen 2 M-LOK

  1. Lowell B. (verified owner)

    Best price found to date

  2. John Lanza (verified owner)

    good service at a fair price

  3. ddorr852 (verified owner)

    great price, fast shipping, great product and, to top it off, getting to support a veteran. Can’t ask for anything better. Will definitely be buying here again for future builds.

  4. Brandon H. (verified owner)

    Everything fix and functions as expected

  5. Roger T. (verified owner)

    Will buy from bking every time. Great costomer service the packages are alway delivered on time and shipped promptly. The prices are spot on.

  6. Chris P. (verified owner)

    My local shop couldn’t get their act together but B. King’s firearms never gave up and kept maintaining good consistent communication with me until the end.

  7. Patrick Dudley (verified owner)

    Very happy. Thank you for great service and prices.

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