Free Shipping

Enter your email to be notified when this product is back in stock:

Submit Close

Enter your email to be notified when this product is back in stock:
Submit Close

Aero Precision AR-15 M4E1 Upper Receiver + Quantum 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

Quantum 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 

Paypal is disabled for this item. 

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.


Very easy to put together, no messing with getting it timed correctly. It improved accuracy also. I used a barrel that had so-so accuracy in the past and first time out it shot better groups with irons than it had previously in a scoped setup with a milspec upper.


Great price! Very nice feel to hand guard and the fit to the enhanced upper is perfect. Super easy to install with barrel nut. Aero Precesion is super high quality!


Write a review

    Low           High

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

  • Brand: Aero Precision
  • Product Code: APM4E1QUANTUM
  • Availability: In Stock
  • $243.99
  • $169.95
  • Free Shipping

Available Options


Toms Tactical Black Nitride M16 / AR-15 Bolt Carrier Group BCG V2
Radical Firearms AR-15 Charging Handle 5.56

Radical Firearms AR-15 Charging Handle 5.56

18 Review(s)


Free Shipping

Toms Tactical AR-15 Lower Build Kit  Blackhawk Stock

Toms Tactical AR-15 Lower Build Kit Blackhawk Stock

12 Review(s)

$99.95 $109.95

Free Shipping