Home / Gun Parts / Sons of Liberty Gun Works / SONS OF LIBERTY GUN WORKS M4-L89 Upper Recvr 5.56 14.5" MidGas P/W Plan B FH
SONS OF LIBERTY GUN WORKS M4-L89 Upper Recvr 5.56 14.5" MidGas P/W Plan B FH
Lowest Price
MSRP
$1,050
Savings
8% off
Verified In Stock at
7 Stores
Updated
Aug 26, 2026
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Code ARMSAGORA — 7% Off Most Items
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13.75 L89 Handguard"
14.5 5.56 NATO Barrel"
7-Sided M-LOK Slots
Drivelock Barrel Nut System
Integral QD's at Barrel Nut on Both Sides
Plan B Flash Hider
Specifications
Caliber
Model
M4-L89 Upper Receiver Group
MPN
U-M4L89-556-145-PB
UPC
657628673033
Description
SONS OF LIBERTY GUN WORKS M4-L89 Upper Recvr 5.56 14.5" MidGas P/W Plan B FH
