Sons of Liberty Gun Works EXO3 Upper 556 16″ Barrel Midlength Gas System

Overview
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