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Aero Precision AR-15 M4E1 Upper Receiver + 15" Quantum Mlok Free Float Handguard Combo Set

The state of the art M4E1 platform starts with the M4E1 Upper Receiver. The M4E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. Since the rail mounting surface and upper are of the same forging, not only is it a stronger system, but it also provides for easy installation of the gas tube with a pre-aligned gas tube hole. Additional lightening cuts save weight and allow for more efficient cooling.

The Quantum free float rail features a lightweight design with 8 different angles for mounting accessories.

Easy barrel installation - Simply insert your barrel assembly into the M4E1 upper and tighten it using the provided barrel nut and wrench. Then slide your rail on and tighten the screws. Within minutes you have a modular, free-floated rail.


  • AR15 M4E1 Enhanced Upper Receiver
  • Keymod or M-Lok Enhanced Free Float Quantum Handguard Rail
  • Handguard mounting screws
  • Barrel Nut
  • Barrel Wrench

Enhanced Upper Receiver Features:

  • M4 Feedramps
  • .250 takedown pin holes
  • Lazer engraved T-marks
  • Comes assembled, with dust cover and forward assist installed
  • Machined from 7075-T6 forged aluminum

15" Quantum Mlok Hanguard Features:

  • 1pc free float design
  • Removable 4-slot picatinny rail section for front sight
  • 8 mounting surfaces for accessories
  • Built in anti-rotation tabs
  • 1.8" inside diameter fits most muzzle devices and 1.5" suppressors
  • Compatible with low profile gas blocks
  • Machined from 6061-T6 aluminum
  • Lightweight Design 

I am very impressed with the design and finish of this upper and handgaurd. Part of an ongoing build so haven't assembled yet yet but seems like a great place to start! Tom's was great to deal with, quick and painless!


This upper and hand-uard combo was perfect for my build. Light-weight and super high quality. Would highly recommend.


Aero Precision always makes quality products. Great price and fast shipping . Highly recommended


Awesome rail and upper, fit great on DPMS lower no wobble at all. Easy to install, great design. Fast shipping also.


Great setup for a nice price. Super high quality, fit and finish is perfect.


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Aero Precision M4E1 AR-15 Upper Receiver + Quantum Mlok Free Float Rail

  • Brand: Aero Precision
  • Product Code: APM4E1QUANTUM
  • Availability: In Stock
  • $219.59
  • $199.95
  • Free Shipping

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