If you're searching for a quality upper receiver that provides superior performance with more features you'll expect to see for the price, Sons Of Liberty Gun Works offers the M4-EXO3 upper with a 13.7-inch barrel chambered to handle a 5.56 NATO round. The M4-EXO3 is SOLGW's latest entry-level upper receiver manufactured to provide you with minimum maintenance and exemplary performance for years.

This M4-EXO3 receiver is a third-generation AR15 upper receiver from SOLGW in their field-tested EXO series upper receivers and rifles. While the barrel is only 13.7 inches, Suns Of Liberty Gun Works has pinned and welded it to make the receiver's overall length 16 inches long with SOLGW's patented NOX muzzle device.  

When you need an upper receiver that can handle dynamic environments and still perform, the M4-EXO3 upper from Sons Of Liberty Gun Works features a barrel of 4150 Chrome Moly Vanadium that's been pressure and heat treated. With an M4-EXO3 from SOLGW, you'll get dependable performance during the lifetime of the upper. The entire upper features a QPQ corrosion-resistant finish and a QPQ coating on the M4 feed ramp extension. Undoubtedly, one of the better upper receivers on the market today, the M4-EXO3 upper receiver is built for steady and continued performance, whether used for hunting, competitive matches, or home defense.

Features:

• Barrel: 13.7" Pinned and Welded/Nox 
• Caliber: 5.56 NATO
• Barrel Material: 4150 Chrome Moly Vanadium
• TPI: 1/2x28
• Barrel Finish: QPQ Corrosion Resistant
• Anodized: Type III Class 2

Specifications:

• BarrelCoating: QPQ Nitride
• BarrelContour: Government
• Barrel Length: 13.7"
• Barrel Lining: QPQ Nitride
• Barrel Material: 4150 Chrome Moly Steel
• Brand: Sons of Liberty Gun Works
• Caliber Gauge: 5.56 NATO
• Color: Black
• Finish: Hardcoat Anodized
• Gas System Length: Mid-Length
• Gas System Type: Direct Impingement
• Muzzle Device: SOLGW NOX Flash Hider
• Thread Pattern: 1/2 X 28
• Twist Rate: 1:7
• Weight: 3 lbs 5.8 oz