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Purpose Built AR-15 Belt Fed 100% Lower Receiver (BFAR)

Black Widow Arms, LLC.

(2 reviews) Write a Review
$295.00
Availability:
Shipping time varies and is dependent upon selected options and receipt of FFL for transfer.
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Product Overview

AR-15 Belt Fed 100% Lower Receiver machined to fit M249 feed bag & nutsack attachments.

Specifications:

  • Stamped 5.56mm
  • 7075-T6 Alloy
  • PDQ Ambi Bolt Catch compatible (w/ minor modification) for operations on both side of the receiver
  • M16 Original Trigger Pocket (standard)
  • Fits M249/MK 46 – 100, 150 & 200 round feed bags
  • Available in Raw Aluminum, Anodized or custom Cerakote
  • 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) - UNAVAILABLE

The goal of this lower was to reduce the distance between the receiver and the 100, 150 and 200 round M249/MK46 “NUTSACK” by pulling it up tighter up to the barrel, allowing for a much better prone position (with/without bipod). Made from 7075-T6 heat-treated aluminum with CERRO forging. Slab side cuts make it a thin as possible profile and with a ambidextrous bolt release for perfect use with the MCR® DUAL-FEED™ UPPER M-LOK® COMPACT (MCR-556-DFRMS) or ARES SHRIKE belt-fed uppers.

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

Reviews

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  • 5
    MCR

    Posted by Johnny on May 13th 2026

    If youre running a beltfed upper, this lower makes it a completely different firearm. It moves any ammo pouch about 2 1/2 to 3" closer to the receiver, allowing you to use a bipod without the ammo pouch scraping on the ground, as well as improves ergonomics when shouldering (ammo pouch not in the way of your arm). Only con is you lose the magazine feed capability but they have a lower for that.

  • 5
    BFAR is perfect

    Posted by William Golding on Mar 21st 2025

    The lower came in perfectly without blemishes and mates with the m249 box without issues.