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The M4-EXO3 is the third generation of our proven EXO series fighting rifles. Our rifles are built with duty and service in mind, whether it be Law Enforcement, Hunting, or home defense. Our EXO series rifles have everything you need and are built to require minimum maintenance for years. We share all our specs with you because it’s not about what a rifle company tells you, it’s about what they don’t.

  • Barrel: Sons of Liberty Gun Works 4150CoMOV 1:7 MPI HPT Barrel
  • Caliber: 5.56 NATO Chamber
  • Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
  • Twist Rate: 1/7 Twist Six Groove
  • Thread Pitch: 1/2-28 Threaded Muzzle
  • Gas Block: .750″ Gas Block Journal with appropriately sized gas port
  • Weight: 25 Ounces
  • Barrel Finish: QPQ Corrosion Resistant Finish
  • Barrel Extension: QPQ coated M4 Feed Ramp Extension
  • High Pressure (proof) Tested (HPT)
  • Magnetic Particle Inspected (MPI)
  • With “F” Marked Taper Pinned Front Sight Block

3rd Generational Upgrades Include

– EXO3 has a 4140 Steel barrel nut vs aluminum on EXO2

– Updated proprietary lockup with a custom 4140 set screw that pulls the rail into the upper

– SOLGW added the anti-rotation pin from the M76/M89

– Added slight finger grooves like the M76/M89 but not as pronounced

– Spaced out the lightening holes to stiffen the rail


Barrel Lengths Available:

  • 10.5″ (Carbine Gas System with A2 muzzle device & Brace)
  • 11.5″ (Carbine Gas System with A2 muzzle device & Brace)
  • 13.7″ (Midlength Gas System with P/W Nox & B5 Stock)
  • 16″ (Midlength Gas System with A2 muzzle device & B5 Stock)