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AT3 PROMOD-K Furniture Kit - AT3 KeyMod Handguard, Magpul Stock & Grip

AT3 PROMOD-K Furniture Kit – AT3 KeyMod Handguard, Magpul Stock & Grip


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Lifetime WarrantyOn All AT3 Brand Products

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot Sights, Handguards, Iron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

Accurize and customize your AR with an AT3 Free-Float Rail and matching Magpul furniture!

Save 15% vs purchasing the parts individually, plus free shipping.

This furniture set contains 3 easy-to-install components – AT3 PROMOD-K Handguard, MOE mil-spec buttstock, and MOE pistol grip.

  • The AT3 PROMOD-K Handguard free floats your barrel, improving accuracy, reducing weight, and providing plenty of room for KeyMod accessories.
  • The MOE mil-spec buttstock – a high quality, economical alternative to standard buttstocks. Designed for light, fast action, the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation.
  • The MOE pistol grip provides legendary Magpul quality in an economical, drop-in upgrade for the standard AR15 pistol grip. The ergonomic, hand filling design combines aggressive texturing with storage core capability.

Use the dropdown boxes to customize your kit with 10 inch, 12 inch, or 15 inch PROMOD-K Handguards.

Further details on each component below.

More Details – AT3 PROMOD-K Handguard

The slim free-float design adds minimal weight while enhancing accuracy by keeping stress off the barrel. With its simple clamp-on design and 10”, 12” or 15” lengths, the PROMOD-K is the perfect upgrade for your existing rifle, or the centerpiece of your next AR-15 build.

Lightweight & Durable

  • Unique lightweight, slim design with Keymod attachment points at the 3, 6, 9, & 12 o’clock positions
  • Rock-solid 6061 aircraft aluminum handguard that withstands the harshest treatment
  • Top rail aligns with AR-15 flat-top upper receivers for perfect alignment of optics, iron sights, and other accessories
  • Handguard clamps securely onto the included steel barrel nut using steel mounting hardware to assure a secure fit with zero movement
  • Backed by the AT3 Lifetime Warranty

Impeccable Fit and Finish

  • Magpul FDE Cerakote finish is more durable than standard hardcoat anodizing, and matches all Magpul FDE accessories
  • Precision CNC milled Keymod and MIL-STD-1913 (Picatinny) rail slots assure proper fit for all your accessories
  • Machined vent holes reduce weight and keep the handguard cool, even after a long day at the range.
  • One 5-slot Keymod-to-Picatinny rail section included

Easy Installation

  • Simply install the barrel nut to the proper spec and clamp on the handguard – no “timing” or shims required.
  • Easily upfit your handguard with Keymod accessories – compatible with all Keymod products including rail sections, forward grips, rail panels, and more.
  • Installation questions? Check out the installation instructions for the PROMOD-K handguard

IMPORTANT NOTE the included barrel nut requires a 29mm or 1 3/16″ wrench (not included). We recommend using a standard 8” length crescent wrench, 29mm or 1 3/16″ box wrench, or 29mm / 1 3/16″ crowfoot with torque wrench.

More Information

  • Full kit – includes all mounting hardware and 1 Keymod 5-Slot Rail section – all included parts pictured below
  • Most rifle setups will require the use of a low profile gas block that sits under the handguard.

Included in the box:

  • Handguard with steel barrel nut and all mounting hardware
  • 5-slot keymod-to-picatinny rail
  • Hex wrenches for handguard and rail sections

AT3™ PROMOD-K Keymod AR-15 Free Float Handguard Hardware Grande


  • Rifle Type: AR-15
  • Material: 6061 Aircraft Aluminum
  • Included Rail Section: One Piece Aluminum Picatinny Rail Section – 3 3/8” Length, 5 slots
  • Finish: Anodized Black or Magpul FDE Cerakote
  • Handguard inside diameter: 1 5/16”
  • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)
  • Weight:
    • 10″ Handguard – 5.4oz (handguard only) / 9.7oz (handguard barrel nut)
    • 12″ Handguard – 6.1oz (handguard only) / 10.4oz (handguard barrel nut)
    • 15″ Handguard – 7.3oz (handguard only) / 11.6oz (handguard barrel nut)

Frequently Asked Questions:

Will this fit my AR-15?

This handguard will work with the majority of mil-spec AR-15’s on the market. In most instances, it will also require the use of a low-profile gas block that fits underneath the rail.

This product will not work with non milspec upper receivers like the Bushmaster Carbon due to the non-standard barrel threads, and it is not compatible with most piston kits as they won’t fit under the handguard.

We’re always glad to verify the fit for your rifle, just contact us! And if it doesn’t fit, we are glad to return it for you. And if you’re new to AR-15, we recommend watching a couple of the videos on our installation video page to understand how the process works.

What tools and additional parts are required?

For parts – most setups will require a low profile gas block.

For tools – we recommend:

  • A vise and non-marring vise block for holding the upper
  • A 29mm wrench (an 8” crescent wrench will work, or a 29mm box wrench, or 29mm crowfoot wrench with torque wrench)
  • A torque wrench can be also be used to assure you stay in the AR-15 barrel nut torque range (30-80 ft lbs). Since this range is quite wide, is torque wrench may not be needed, but is recommended if you’re not experience in torquing AR-15 barrel nuts.

More Details – MAG400 Mil-spec Carbine Stock

Magpul Original Equipment (MOE) is a line of firearm accessories designed to provide a high-quality, economical alternative to standard weapon parts. The MOE line distinguishes itself with a simplified feature set, but maintains Magpul engineering and material quality.

The Magpul MOE Stock – Mil-Spec Model is a drop-in replacement buttstock for AR15/M16 carbines using mil-spec sized receiver extension tubes. Designed for light, fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation. The Mil-Spec Model includes a standard 0.30″ rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.

Made in U.S.A.


  • Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below)
  • Sloping cheek weld combines a slim profile with user comfort
  • Shielded release latch prevents snagging and accidental operation
  • Premium chrome-silicon lock spring provides positive locking and long service life
  • Side mounting slots accept optional cheek risers for NON-AR15/M16 applications
  • Removable 0.30″ Rubber Butt-Pad offers an anti-slip surface and increases impact protection
  • Compatible with Magpul ASAP® and other receiver-mount sling attachments
  • Sling Mounts
  • Rear/Bottom – 1.25″ sling loops
  • Toe – Lanyard hole for custom para-cord rigs
  • Optional Accessories*
  • Extended Rubber Butt-Pad, 0.55″
  • Enhanced Rubber Butt-Pad, 0.70″
  • Cheek Risers (0.25″, 0.50″, 0.75″ for NON-AR15/M16 applications)
  • Specifications*
  • MOE, Mil-Spec (stock configuration)
  • Weight: 0.50 lb.
  • Weight, w/ Rec. Extension: 0.75 lb.
  • Length, Maximum: 6.90 in.
  • LOP Adjustment Range: 3.25 in.
  • LOP, M4 Collapsed: 10.70 in.
  • LOP, M4 Extended: 13.95 in.

NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec and commercial-spec. If you have a commercial-spec extension on your rifle, make sure to order the Commercial-Spec MOE. Please see the “Related Info” section above to determine which tube you have.

If you have one of the uncommon military tubes with an extended slant-back, along with the Mil-Spec MOE you will also need to order the Extended Rubber Butt-Pad, 0.55″ (sold separately).

* Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.

Standard Rubber Butt-Pad, 0.30″ weight: 0.08 lb. Optional Extended Rubber Butt-Pad, 0.55″ weight: 0.11

More Details – MAG415 Magpul MOE Grip – Pistol Grip for AR-15

The MOE Grip provides Magpul quality, feel, and durability in an economical, drop-in upgrade for the standard AR15/M16/M4 pistol grip. The ergonomic, hand filling design combines aggressive texturing with storage core capability.

With a similar shape to a ‘medium’ sized MIAD, the one-piece reinforced polymer construction provides simplicity and a reduced cost while still maintaining the durability needed to withstand operational environments. The MOE Grip accepts optional storage cores for gear stowage and includes a basic grip cap. All mounting hardware included.

Made in U.S.A.


  • Replacement for AR15/M4 pistol-grip*
  • One-piece reinforced polymer construction
  • Beavertail backstrap for enhanced ergonomics
  • Positive anti-slip texture
  • Includes a basic grip cap, but accepts optional Storage Cores for customized gear stowage


  • MOE Grip
  • Weight, w/hardware: 2.8 oz.
  • Height, receiver to bottom: 4.0 in.
  • Thickness, max: 1.2 in.

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Customer Reviews

Based on 1 review

The hand guard screws were of poor quality, easily stripped all 3 just trying to tighten. Would not recommend this set because of the hand guard - stock and grip were fine. They are fast shippers..

Sorry to hear of your experience. We've reached out to you via email in regards to a solution for this issue. Thank you for letting us know! -- LM