M4-89 5.56MM 16″ Combat V2 Rifle

At Sons of Liberty Gun Works we believe in Quality Mil-Spec or better parts. We believe there is no substitute for quality and that your gun should be built right the first time, ready for hard use right out of the box. We believe a quality Bolt Carrier Group and a quality, accurate and long lasting barrel are the heart of a Combat Grade weapon. We believe in properly tuned weapons using the correct gas system length and quality buffer system components. We believe in our products and we back them up with a Lifetime Warranty. Our weapons our meant to be used hard and go in harm’s way, they won’t let you down.

All rifles are test fired twice in shop to ensure proper function.

The M4-89 is our premier fighting rifle, featuring a 16″  V2 Combat barrel, intermediate buffer system, Liberty Fighting Trigger, and B5 furniture. At Sons of Liberty Gun Works we always tell our customers, its not what a rifle company tells you, it’s what they don’t tell you. Below you will find the complete specifications on the M4-89. We have built our guns to run through years of hard use, and we have nothing to hide.

Barrel: V2 Combat 16” 4150CMV Button Rifled
Caliber: 5.56 NATO Chamber
Barrel Steel: 4150CMV
Twist Rate: 1/7 Twist Six Groove
Thread Pitch: 1/2-28 Threaded Muzzle
Gas Block: .750″ Gas Block Journal with appropriately sized gas port
Barrel Finish: QPQ Corrosion Resistant Finish
Barrel Extension: QPQ coated M4 Feed Ramp Extension
High Pressure (proof) Tested (HPT)
Magnetic Particle Inspected (MPI)

Lower Receiver: Sons of Liberty Gun Works Forged Lower Receiver – Angry Patriot
Material: Made from Mil-Spec 7075-T6 aluminum
Finish: Anodized
Contour is fully machined leaving no flash marks from the forging.
Hidden lowers are cut with M16 auto pocket.
Safe, Fire, and Full Auto Pictograms.
Angry Patriot Roll Mark

Buffer System: Enhanced A5 Buffer System
Receiver Extension: 9 Position Loyal 9 Receiver Extension Tube made from 7075-T6 Aluminum
Buffer: Intermediate Buffer
Buffer Spring: Sprinco Green Spring
Receiver end plate: Quick Detach End Plate with properly staked Forwards Controls Design Castle Nut

Fire Control Group: Liberty Fighting Trigger 6- 6.5lb

Safety Selector: Quick Ambi Selector

Grip: B5 P23 Grip

Stock: B5 Bravo Stock Black

Upper Receiver:
Material: Made from Mil-Spec 7075-T6 aluminum.
Finish: Anodized
T-Marks: Engraved T-Marks

Charging Handle: Liberty Charging Handle (LCH)

Gas Block: Sons of Liberty Lo-Pro Gas block made from 4140 Steel and Nitride Treated with Knurled Head Set Screws

Gas Tube: Sons of Liberty Mid Length Melonited Stainless Steel

Rail System: 15″ Sons of Liberty Gun Works M89 Drive Lock Rail system.
Weight: 15 OZ
Inside Diameter: 1.8″ ID
Finish: Anodized
Barrel Nut: Steel with QPQ Finish
Free Floating Design
Grade 8 Fasteners
Anti Rotation- Anti Slip Design
No Special Tools Need for Barrel Nut
Continuous top rail design
Mil-Spec 1913 Mounting rails

Muzzle Device: NOX 2 Chamber Brake

Sights: None, Optics Ready

Includes: Tactical Soft Case, Three SOLGW Steel 30rd Mags, 2oz Bottle of S.P.E.C. 76 Lubricant, SOLGW Sticker & Patch, copy of the US Constitution, and LIFETIME Warranty Certificate