Gunner Quinn
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
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Available in 13.7” and 16” barrel lengths
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Mid-length gas system for smoother cycling and reduced recoil
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Nitride-treated barrel for enhanced longevity and corrosion resistance
Bolt Carrier Group (BCG)
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Military-grade, high-pressure tested, magnetic particle inspected (HPT/MPI)
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Chrome-lined and full-auto rated for maximum durability
Handguard: The M89 Free-Float Rail System
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Lightweight yet rigid design
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M-LOK compatibility for mounting accessories with ease
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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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