SOLGW M4-76 Rail 16″ AR15 5.56 Upper Receiver


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Sons of Liberty Gun Works believes in Quality Mil-Spec or better parts. They believe there is no substitute for quality and that your gun should be built right the first time, ready for hard use right out of the box. They believe a quality, accurate and long-lasting barrel is the heart of a Combat Grade weapon. They believe in properly tuned weapons using the correct gas system length and quality buffer system components. All of these beliefs are forged together to bring you the SOLGW M4-76 Complete Upper with 16″ 5.56 NATO Combat Barrel and an A2 Flash Hider. Featuring the M76 Handguard. They believe in their products and back them up with a Lifetime Warranty.

Does not include a BCG or Charging Handle. We carry several different options for bolt carrier groups and charging handles, including SOLGW

SOLGW didn’t reinvent the wheel…they just made it better

Sons of liberty gun works M4-76 upper receiver side view


  • 16” 5.56 NATO barrel
  • 4150 chrome moly vanadium steel
  • HPT and MPI
  • QPQ Nitride finish
  • 1/7 twist rate
  • Mid-length gas system
  • 4140 steel .750” gas block
  • M76 M-LOK free float handguard
  • 1/2×28 with A2 flash hider
  • 7075-T6 aluminum Cerra forged receiver
  • Type III Class 2 hardcoat anodized black
  • T-Marked upper
  • Dry film lube bolt carrier channel


  • Barrel Coating: Salt Bath Nitride
  • Barrel Contour: Government
  • Barrel Length: 16
  • Barrel Material: 41V50 Chrome Moly Vanadium Steel
  • Caliber: 5.56 NATO
  • Gas System Length: Mid-Length
  • Gas System Type: Direct Impingement
  • Handguard: 15.5″ M-LOK Rail
  • Muzzle Device: A2 Flash Hider
  • Thread Pattern: 1/2 X 28
  • Twist Rate: 1:7

Don't Forget Your BCG and Charging Handle

Weight 4.06 oz
Dimensions 30.25 × 3.25 × 2.75 in







Sons of Liberty Gun Works

High-end AR15 rifles, parts, and accessories. Made with love and patriotism in Texas. Sons Of Liberty Gun Works is a premium manufacturer renowned for producing high-quality, hard-use firearms and accessories. With a commitment to excellence, they offer a wide range of products such as M4 Series blasters, MK10 Series blasters, Nox flash hiders, Mil-Spec BCG, high-quality barrels, uppers, and Exo-2 Handguards. Their dedication to crafting superior AR-15s and firearm components has solidified their position as a leading name in the firearms industry.
Sons of Liberty Gun Works SVG logo


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Size Chart

Fits on any standard Mil-Spec AR15 lower receiver. For best results, pair this with a SOLGW lower.

SOLGW M4-76 Rail 16″ AR15 5.56 Upper Receiver

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