Description
Upgrade your AR-15 build with the Sons Of Liberty Gun Works M4-EXO3 5.56 Complete Upper featuring a 13.7-inch barrel and pinned-and-welded HuxWrx muzzle device. Engineered for reliability in demanding conditions, this upper delivers battle-proven performance without unnecessary frills, making it ideal for tactical enthusiasts, hunters, and home defenders seeking a durable, low-maintenance solution.
Key Features
Premium Barrel Construction: Crafted from 4150 Chrome Moly Vanadium steel with a QPQ nitride finish for superior corrosion resistance and longevity, ensuring consistent accuracy even after thousands of rounds.
Mid-Length Gas System: Optimized for smoother cycling and reduced recoil, enhancing shooter comfort during extended sessions while maintaining compatibility with a wide range of 5.56 NATO ammunition.
EXO3 M-LOK Handguard: Lightweight 13-inch rail with anti-rotation tabs and finger grooves for secure accessory mounting, providing endless customization options without added bulk.
HuxWrx Muzzle Device: Pinned and welded to achieve 16-inch overall length for NFA compliance, this advanced suppressor-ready device minimizes flash and noise, improving low-light performance and hearing safety.
Complete Assembly: Includes a high-quality bolt carrier group (BCG) and charging handle, ready to drop onto your lower receiver for immediate use.
Technical Specifications
Barrel Length: 13.7 inches (pinned to 16 inches OAL)
Caliber: 5.56 NATO
Twist Rate: 1:7 RH, six-groove for optimal stabilization of heavier bullets
Gas System: Mid-length with .750-inch gas block journal
Barrel Profile: Government/SOCOM hybrid for balanced weight and maneuverability
Finish: Nitride/Melonite for enhanced durability
Weight: Approximately 5.5 lbs (complete upper)
Why Choose the M4-EXO3 Upper?
This SOLGW upper addresses common pain points like reliability failures and excessive maintenance in tactical setups. Built to mil-spec standards with high-pressure tested (HPT) and magnetic particle inspected (MPI) components, it withstands harsh environments while requiring minimal upkeep. Whether you’re configuring a duty rifle or a precision carbine, the 13.7-inch configuration offers the ideal blend of velocity and handling, outperforming stock uppers in accuracy and suppressor compatibility. Customers rave about its out-of-the-box dependability, solving issues with jamming or wear that plague lesser builds.
Don’t settle for subpar performance—equip your AR-15 with the M4-EXO3 today and experience the difference in craftsmanship that turns a standard rifle into a trusted companion for any mission.
Frequently Asked Questions
Q: Is this upper compatible with standard AR-15 lowers?
A: Yes, it’s fully mil-spec compatible, ensuring a seamless fit with most AR-15 lower receivers.
Q: Does the pinned HuxWrx device affect suppressor use?
A: The HuxWrx is designed for quick-detach suppressors, allowing easy attachment without permanent modifications.
Q: What maintenance is required?
A: Routine cleaning after use is recommended; the nitride finish and quality materials minimize corrosion and wear for low-maintenance ownership.
Weight 112.08 oz Dimensions 31.6 × 13.6 × 7.8 in Barrel Finish
Nitride / Melonite
Barrel Profile
Government / SOCOM
Cartridge Compatibility
5.56 NATO
Barrel Length
13.7
Gas System Length
Midlength
Twist Rate
1-7
BCG / Charging Handle
Included
MPN 30250
SKU: 30250
