Aero Precision Quantum M-LOK AR-15 Handguard - Black - 15"

Manufactured by Aero Precision
SKU: APRA400105C
MPN: APRA400105C
Manufactured by Aero Precision
4 Reviews

In Stock

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Note: This handguard is for use with the Aero M4E1 enhanced upper receiver and does not include a barrel nut.

If you are on the market for a lightweight minimalist handguard, the Aero Precision Quantum M-LOK handguard is the one for you. It features a smooth octagonal shape with M-LOK attachment points on every flat, so you can easily adapt this rail for any situation. The rigid M-LOK attachment system allows you to quickly rearrange rail sections, lights, grips, bipods, and more without the extra weight of full length rails. This free float handguard is made from 6061-T6 aluminum and has a hardcoat anodized black finish that can withstand harsh weather and hard use. The built in anti-rotation tabs combined with the proprietary locking system on the M4E1 enhanced upper receiver ensure that this rail won’t loosen over time. The slightly larger 1.78” inside diameter is designed to be used with most 1.5” suppressors and muzzle devices. The 15” length is also capable of fully covering rifle length gas systems. The Aero Precision Quantum AR-15 handguard is the perfect addition to your M4E1 enhanced upper receiver.

  • Designed for use with M4E1 enhanced upper receiver (includes mounting hardware)
  • 15” 6061-T6 aluminum with hardcoat anodized black finish
  • 1-piece free float design
  • Built in anti-rotation tabs
  • 8 mounting surfaces with M-LOK attachment points
  • Compatible with low profile gas blocks and 1.5” suppressors
  • Includes 4-slot picatinny rail
  • Polymer front Magpul MBUS sights may require modification to the sight for installation

Included with the Quantum is a 4-slot picatinny rail attachment for the top muzzle end of the handguard. This allows you to install your favorite back up sights without fear of losing your zero. However, due to the profile, some sights like the Magpul MBUS may require slight modification for them to fit correctly. The screws need to install it to the enhanced upper are also included.

Aero Precision takes some of the most state of the art manufacturing techniques and equipment derived from their work in the aerospace industry and applies it to their products in the firearms industry. They have utilized their knowledge from years of building aircraft components to design and engineer AR-15 handguards, receiver sets, scope mounts, and more. They treat every product as if it were a precision flying machine and adhere to strict quality standards to ensure law enforcement, military, and civilian customers receive a product they can rely on.
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Accessory AttachmentM-LOK
BrandAero Precision
FinishHardcoat Anodized
Gas System LengthExtended Rifle
Handguard Length15 in
Inner Diameter1.78
MaterialAluminum - 6061-T6
Weight13.6 oz.

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see

California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

4 reviews

  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews
  • 1 star
  • 0 reviews

Aero Quantum M-Lok Handguard 15"

by -

This handguard looks great on my build. It works perfectly with the M4E1 upper receiver from Aero Precision. Primary Arms has a great price on this handguard. I was extremely happy to get such a deal on this piece.

AP Quantum M-Lok HG


This is a great handguard, only giving it four stars because there is room for improvement. I have a 15" one and love it.<br><br>Pros: <br>This is probably the most versatile handguard on the market. You can attach any M-Lok compatible accessory to all eight sides. It includes a Picatinny section you can screw into the top for a front sight post. Its very lightweight and simple. The price to value is excellent. <br><br>Cons: <br>The barrel nut only has 4 holes for the gas tube. This can be a pain when trying to get proper torque while also lining it up with the gas tube. It does come with shims, just be sure you can devote some time to getting it right. Second main issue: you must use thread lock if you want the eight screws to stay put. Anyone who says otherwise doesn't spend time at the range with this HG. I recommend the orange thread lock. Blue will melt off and red will force you to use a heat gun and still probably have to drill a few stubborn ones out if you ever need to get to the gas block.


by -

Awesome handguard, bought a BAR nut for it and threw it on my M4E1 lower and it looks great. One of my favorite builds so far.


by -

Very high-quality for the price was very easy to put on has A lot of room for accessories. I highly recommend this product and will be buying more