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OmniFeed Lower Receiver

Black Widow Arms, LLC.

(1 review) Write a Review
MSRP: $500.00
$399.00
(You save $101.00 )
Availability:
Limited Availability beginning May 2026. Shipping time varies and is dependent upon selected options and receipt of FFL for transfer.
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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, adds 3 weeks to delivery)

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 Aluminum
    • Anodized ($39 upgrade)
    • Cerakote - Armor Black, MagPul FDE, MagPul OD Green, Tungsten ($69 upgrade)
    • Other Custom Color ($139 upgrade) - specify in Order Notes at checkout)
  • Fire Controls ($95 upgrade) - UNAVAILABLE
  • Serial Number ($95 upgrade) - specify in Order Notes at checikout
  • NFA Registration for Short-Barreled Rifle builds ($100 fee)

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

Reviews

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  • 5
    Omni feed

    Posted by Mo on Jun 5th 2026

    Works flawlessly and looks great with my MFR belt fed upper. Scott kept me updated throughout the whole process. Was well worth the wait. The best lower you can buy for your beltfed!!