Home Gear Sons of Liberty Gun Works M4-89: The Battle-Proven AR-15 You Didn’t Know You Needed!

Sons of Liberty Gun Works M4-89: The Battle-Proven AR-15 You Didn’t Know You Needed!

by Gunner Quinn
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Sons of Liberty Gun Works: A Name You Can Trust

Sons of Liberty Gun Works (SOLGW) has built a reputation for crafting some of the most durable and combat-ready rifles on the market.

With a commitment to military and law enforcement standards, SOLGW rifles are designed to outlast and outperform many competitors in the field.

Their meticulous quality control and use of high-end materials make them a go-to choice for serious shooters who demand reliability.

M4-89 5.56 NATO: Key Features 

The M4-89 is a premium AR-15-style rifle built for hard use. Here’s what sets it apart:

Barrel & Gas System

  • Available in 13.7” and 16” barrel lengths

  • Mid-length gas system for smoother cycling and reduced recoil

  • Nitride-treated barrel for enhanced longevity and corrosion resistance

Bolt Carrier Group (BCG)

  • Military-grade, high-pressure tested, magnetic particle inspected (HPT/MPI)

  • Chrome-lined and full-auto rated for maximum durability

Handguard: The M89 Free-Float Rail System

  • Lightweight yet rigid design

  • M-LOK compatibility for mounting accessories with ease

  • Full-length Picatinny top rail for optics and sights

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Trigger: Enhanced Mil-Spec

Materials & Coatings

Sons of Liberty Gun Works M4-89 Specs

Specification Details
Caliber 5.56mm NATO
Weight 6 lbs., 9.5 oz.
Overall Length 35.75 inches (stock extended), 32.25 inches (stock collapsed)
Upper Receiver Forged 7075 T6 aluminum
Lower Receiver Forged 7075 T6 aluminum
Barrel Length 13.7 inches
Barrel Material 4150 CrMoV (Chrome Moly Vanadium per MIL-B-11595E)
Twist Rate 1:7 twist, six groove
Gas System Mid-length
Muzzle Device SOLGW NOX flash suppressor/muzzle brake
Handguard 13-inch SOLGW M89 M-LOK
Trigger SOLGW Liberty Fighting Trigger, 5.5 lbs. pull
Stock B5 Systems Bravo
Pistol Grip B5 Systems P23
Buffer System 9-position A5 Buffer System with Sprinco Green Spring
Charging Handle Liberty Charging Handle with high gas shelf (ambidextrous)
Safety Selector Quick Ambi Selector – Billet Steel, 50° rotation, Ambi, QPQ Finished
Barrel Finish QPQ Corrosion Resistant Finish
Barrel Extension QPQ coated M4 Feed Ramp Extension
Gas Block .750″ Gas Block Journal with appropriately sized gas port
Barrel Testing High Pressure (proof) Tested (HPT), Magnetic Particle Inspected (MPI)
Receiver Extension Intermediate Receiver Extension Tube made from 7075-T6 Aluminum
Receiver End Plate QD Mil-Spec with properly staked Castle Nut
Thread Pitch 1/2-28 Threaded Muzzle
Warranty Lifetime Warranty
Additional Features Integral QD sockets on handguard
Barrel Length Options 11.5″, 12.5″, 13.7″, 14.5″, 16″, 18″ (varies based on model and configuration)
Caliber Options 5.56 NATO, .223 Wylde, 6.5 Grendel, 6mm ARC (varies based on model and configuration)

Real-World Performance: How It Shoots

Accuracy & Handling

The M4-89 is built for accuracy straight out of the box. The mid-length gas system paired with a properly gassed barrel ensures smooth recoil impulse, reducing muzzle rise and allowing for fast follow-up shots. Whether you’re running it suppressed or unsuppressed, the rifle cycles cleanly and reliably.

Reliability Under Harsh Conditions

I’ve personally run this rifle through dirt, rain, and long-range sessions without a single malfunction. Unlike cheaper AR-15s that struggle with high round counts, the M4-89 is battle-ready and built to last.

Anecdote: Field Experience

On a recent training exercise, I ran 500 rounds through the M4-89 without a single hiccup. Compared to my previous go-to rifle, the difference in recoil management and overall feel was night and day. The M4-89 felt like a refined, professional-grade tool.

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