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Sons of Liberty Gun Works M4-76 5.56 AR-15 Partial Upper Receiver - 16"

AR-15 Handguard

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Sons of Liberty Gun Works M4-76 5.56 AR-15 Partial Upper Receiver - 16"


The SOLGW M4-76 is a great entry level AR-15 barreled upper receiver package that comes with all the features you want for a reliable, do-it-all carbine built for duty. This model features a 16” barrel machined from 4150 chrome moly vanadium steel and QPQ Nitride finished inside and out. The six groove 1/7 twist rate is optimal for heavy 62 grain 5.56 NATO surplus ammunition. The mid-length gas system and appropriate gas port size ensures reliable function under any conditions and minimal recoil. The government profile barrel and gas system are protected by the M76 free float handguard with M-LOK slots for full customization potential. Build your duty rifle today with Sons of Liberty Gun Works.



  • 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
  • 1/2x28 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
More Information
SKU M476UPPER-16-556
Product Type AR-15 Handguard
Manufacturer Sons of Liberty Gun Works
Thread Pitch 1/2x28
Twist Rate 1:7
Color Black
Gas Length Mid
Finish Anodize
Option AR-15
Barrel Length 16"
Caliber 5.56 NATO
Threaded Yes

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