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Aero Precision M4E1 AR-15 Upper Receiver + Gen 2 Free Float Rail Combo Set

This Upper Receiver Handguard Combo now includes the new Gen 2 Enhanced Handguard!
Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail.

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.

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
  • Gen 2 Keymod or M-Lok Enhanced Free Float 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

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

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I bought this upper and handguard and installed it on a aero gen 2 lower fit like a glove. Running a stainless steel barrel fit perfect too. Gen 2 handguard fits tight also. Just quality products and super fast shipping. Thanks again.A+++++


This is an incredible innovation bravo Aero for the easiest build I have ever done. I have used the shim type barrel nut hand guards and I thought there's got to be a better way and here it is. While the others aren't impossible, nothing is easier than putting the barrel in the upper receiver and torqueing. 5 stars for ease of use, 5 stars for quality and finish, 5 stars Toms Tactical for price and fast service. Perfect for the first time builder a little intimidated by the thought of building your own rifle don't hesitate to try with this combo


The is a great upper combo. Everything is well made and went together easily. It feels nice in my hands and does an excellent job of dispersing the heat.


Great deal I got on this upper and hand guard. I really like Aero's products and these are are no exception at a great price from Tom's. I also got free shipping and it arrived at my door in two business days. This was an amazing shopping experience I had with Tom's. Will come back for these prices.


Excellant service same day shipping for the order, I am impressed and this is my second order with Tom's and will continue to use them.


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Aero Precision M4E1 AR-15 Upper Receiver + GEN 2 Free Float Rail

  • Brand: Aero Precision
  • Product Code: APAR600251
  • Availability: Out Of Stock
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