AR15 Quantum KeyMod Handguards

Aero Precision AR15 Quantum KeyMod Handguards

AR15 Quantum KeyMod Handguards Product Sku: APPG400001

Our Quantum KeyMod Free Float Handguards minimize bulk while providing an adaptive system that is big on features. With multiple mounting options, this affordable, rigid system can adapt to any mission. Machined to exacting dimensions from 6061-T6 aluminum it is the perfect handguard for your next AR15 build.


  • Designed to work with our M4E1 Upper Receiver
  • 1pc free float design
  • Removable 4-slot picatinny rail section for front sight
  • Built in anti-rotation tabs
  • 7 mounting surfaces for KeyMod accessories
  • 1.78" inside diameter fits most muzzle devices and 1.5" suppressors
  • Compatible with low profile gas blocks
  • Made in the USA

Are you attaching this handguard to a standard threaded upper receiver?
Make sure to select "Yes" under the BAR Barrel Nut option above (shims included). Our handguards use the BAR interface and do not work with a standard barrel nut. If you are using our M4E1 Enhanced Upper Receiver, no additional pieces are needed. Purchased with a handguard, the BAR Barrel Nut is $20 ($40 when sold separately).

*Please note - This handguard is specific to the AR15/M4E1 platform. It is not compatible with the M5 .308/M5E1 platform.

Made In America? Yes
Platform AR15
Material Machined from 6061-T6 aluminum
Series KeyMod
Weight(s) 7" - 7oz, 9" - 8.8oz, 12" - 11.35oz, 15" - 13oz
Other Handguard Screw Torque - 25 in-lbs

Customer Reviews

4 Item(s)

Good cheap rail Review by David
Great rail, lightweight, and easy to install. My only beef is my magpul buis doesn't work on the front rail section. The push button won't go down far enough. Have to leave it up all the time. (Posted on 12/19/2016)
Dummies can install, Light Review by bonkers12
First, I purchased the (BLEM) version of this and couldn't find any defects at all. This is a very lightweight handguard and an ingenious design. Attached to my M4E1 upper very fast and feels solid. Only drawback, if you're buying a (BLEM) one, the screws that attach this to the upper are NOT included. (Posted on 12/7/2016)
Great Product and Service Review by 513
Not new to the firearm community, but new to the AR platform. I purchased AP’s OEM rifle to start. To ensure everything would fit like it was supposed to (instead of using 3rd party vendors) I got AP’s 15” hand guard. It fit perfect and looked great. The only hiccup was the barrel nut did not come with any shims as shown on their website. Called them up and they shipped me a set of shims that day at no cost. The hand guard and customer service is top notch. These are my go to people for my AR needs. (Posted on 12/7/2016)
Great Budget Handguard! Review by Sean
I've been building ARs for a while now and have purchased top and bottom tier parts and accessories with mixed results overall. This new Quantum series is honestly one of the best budget options I've seen so far. While it is not the absolute highest quality handguard I've ever handled, I can have three of these for that price and they are excellent for that cost. The anodizing has a couple of spots, but I have no real criticisms beyond that.

Aero has been great with everything I've purchased, but in confidence! (Posted on 5/4/2016)

4 Item(s)

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