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Our email service at blackwidow@ntelos.net has been discontinued. To contact us please email blackwidowfirearms@proton.me or call/text 540-849-5087.

Dual-Feed AR-15 Belt Fed 100% Lower Receiver

Black Widow Arms, LLC.

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MSRP: $500.00
$395.00
(You save $105.00 )
Availability:
Limited Availability beginning April 16th, 2026: Cerakote finishes will ship within 3 weeks. Anodized lowers will ship in mininum of 3 weeks.

Out of stock

Product Overview

The ONLY Lower in the world purpose built for the 5.56mm belt fed upper.

The patent pending design features a super low profile that perfectly mates on all dimensions of the upper, capable of accepting mags and 50/100/150/200 feed boxes/bags without the use of an additional adapter. 

100 % Lower custom machined to fit M249 feed bag & Nut-Sack attachments as well as magazines.

Available in Raw Aluminum, Anodized or custom CERAKOTE (+$60)

Specifications:

  • Fits M249/MK 46 – 100, 150 & 200 round feed bags and all standard M16/ AR-15 type Mags
    7075-T6 Billet Alloy
  • PDQ Ambi Bolt Catch compatible (w/ minor modification) for operations on both side of the receiver
  • M16 Standard Original Trigger Pocket
  • Fire Control Settings "SAFE – FIRE – AUTO"

Custom Options include:

  • Finish
    • Standard - Raw or Anodized
    • Custom - Armor Black, MagPul FDE, MagPul OD Green, Tungsten, or other color ($60 upgrade, specify "Other" in Notes at checkout)
  • Fire Controls ($95 upgrade) - UNAVAILABLE
  • Serial Number ($95 upgrade) - Specify customization in Order Notes
  • NFA Registration for Short-Barreled Rifle builds ($100 fee)

State Restrictions may apply, contact your local FFL to verify legality prior to purchase.

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