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THOR M3DF Heavy Belt-fed Machinegun .50 BMG

Features Overview

  •  M3 based design
  • High rate of fire
  • Lighter weight
  • Increased accuracy
  • Increased reliability
  • Simplified maintenance
  • Mechanical or electronic fire control
  • Fluted barrel
  • Improved flash suppressor
  • Optional adjustable-rate buffer, sighting systems, open bolt lock
  • Made in the USA



  •  M3 Based Design
    • Minimal logistics change required, uses more than 85% NSN components
  • High Rate of Fire
    • 1,100 rounds per minute (1025 +- 75 rounds per minute)
  • Light Weight
    • M3D 74.5 lbs
  • Linear Bushing System
    • Precision axial barrel control allows increased accuracy and reliability due to receiver and internal components operating under less stress
  • Simplified Maintenance
    • Barrel assembly can be removed through front or rear of receiver
  • Mechanical or Electronic Fire Control
    • Can use either spade grip back plate, or solenoid fire control
  • Improved Flash Suppressor
    • Completely eliminates visible flash
    • Thicker tangs to improve durability
  • Fluted Barrel
    • Larger surface area for better barrel cooling
    • Improved rigidity over light weight aircraft barrel
  • Feeds from either side
    • Standard feed chute and cartridge stop configurations for either LH or RH feed

Additional Options

  • Open Bolt System/Bolt Lock
    • Can operate in either open or closed bolt, or manual bolt lock to reduce dangerous ‘cook off’ situations
  • Adjustable Rate Buffer
    • Fully sealed, maintenance free, hydraulic design
    • Manual knob or electronic rate selection
    • Approx 200 round per minute difference
  • Advance Combat Sight 50 System from Crane Tactical
    • Adapts several additional targeting devices
      • PEQ2A IR laser, PAQ4 IR laser, EOTech, or other Weaver rail mounted sights/lasers


Service Intervals

Replace the following parts as a minimum every 2,500 rounds:

  • Ejector Spring
  • Sear
  • Sear Slide
  • Sear Spring
  • Inspection of Feed Pawl and Feed Pawl Springs

Replace the following parts as a minimum every 5,000 rounds:

  • Extractor Body
  • Sear
  • Sear Spring
  • Sear Slide
  • Sear Slide Stop Pin
  • Firing Pin
  • Firing Pin Extension
  • Feed Pawl Springs
  • Inspection of Feed Pawl

Depot maintenance recommended every 50,000 rounds. Receiver life should reach 100k+ rounds like a regular M2/M3.

Support Equipment

Field support cleaning kit (Standard 50 Caliber) composed of:

Hot Barrel Mitten

Headspace and Timing Gage (M2HB)

Headspace and Timing Gage (M2HB-QCB)

5 Piece Cleaning Rod w/ T-Handle

Ratcheting Chamber Brush

Bore Brush

Small Bottle LSA

Patch Jag

Replacement parts kits:



Download Spec Sheet

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For More Information

THOR Global Defense Group, INC.
1206 Knesek Lane
Van Buren, Arkansas, 72956 USA

Phone: +1-479-474-3434
Fax: +1-479-262-6925
DUNS: #008351722

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