Home / Products / Sons Of Liberty Gun Works / Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
Lowest Listed Price
$950
MSRP
$950
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Updated
Aug 26, 2026
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Specifications
MPN
M489UPPER-13.7-556
Description
Specifications: Handguard Length: 13" Barrel: Sons of Liberty Gun Works 4150CoMOV 1:7 MPI HPT Barrel Barrel Steel: 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E) Twist Rate: 1/7 Twist Six Groove Thread Pitch: 1/2-28 Threaded Muzzle Muzzle Device: NOX Keymo Muzzle Device Gas Block: .750 Gas Block Journal with appropriately sized gas port Gas Length: Mid Barrel Finish: QPQ Corrosion Resistant Finish Barrel Extension: QPQ coated M4 Feed Ramp Extension High Pressure (proof) Tested (HPT) Magnetic Particle Inspected (MPI) Weight: 3 lbs 6.6 oz Please NOTE: Bolt carrier group and charging handle is not included. This upper is pinned.
