American Made Parts for American Rifle Builders

Sons of Liberty Gun Works

Sons of Liberty Gun Works, M4-89 5.56X45mm NATO 16" BBL Complete Rifle

Retail: $1,590.99
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The M4-89 is one of the premier fighting rifles we offer. It houses a combat grade barrel, A5 buffer system, Liberty Fighting Trigger, and B5 furniture. At Sons of Liberty Gun Works, we always tell our customers that it’s not what a rifle company tells you, it’s what they don’t tell you. Below you will find the complete specifications of the M4-89. We have built our guns to run through years of hard use, and we have nothing to hide.

Features and Specifications:

  • Trigger: Liberty Fighting Trigger
  • Gas Block: .750″ Gas Block Journal with appropriately sized gas port
  • Gas System: Midlength
  • Stock: B5
  • Thread Pitch: 1/2-28 Threaded Muzzle
  • Muzzle Device: A2
  • Barrel Twist Rate: 1/7 Twist Six Groove
  • High Pressure (proof) Tested (HPT)
  • Magnetic Particle Inspected (MPI)
  • Combat Grade Barrel: Sons of Liberty Gun Works 4150CoMOV 1:7 MPI HPT Barrel
  • Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
  • Barrel Finish: QPQ Corrosion Resistant Finish
  • Barrel Extension: QPQ coated M4 Feed Ramp Extension
FFL required for transfer:
Please submit or have FFL submit ATF Form 8 to OR fax to 402-256-6481. Item will not ship until FFL information has been provided and verified.
Must be 18 or older to purchase:
Federal law requires that you be 18 years of age or older to purchase a complete rifle.