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Sons of Liberty Gun Works

M4-SDI Severe Duty Carbine w/ Cold Hammer Forged Barrel CUSTOMIZABLE

$ 1,799.00 $ 1,699.00 -24%
or

Need more details? Call us at (210) 400-5992

M4-SDI

Highlights:

16" Cold Hammer Forged Barrel
IMOD Stock
Intrepid Rail 

ALG Single Chamber Brake


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 such as the Vltor A5 system and Sprinco Tactical Buffer Springs. 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-SDI is a extremely hard use carbine fitted with a Sons of Liberty Cold Hammer Forged Barrel. It has an Intrepid rail systems, and Liberty Fighting Trigger. It also features a Vltor IMOD stock and an upgraded Vltor Compensator. This rifle is built to be shot and be shot a lot. 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-SDI. We have built our guns to run through years of hard use, and we have nothing to hide.

Sons of Liberty Gun Works Bolt Carrier Group HPT/MPI Check out the specs here:

https://sonsoflibertygunworks.com/collections/components/products/solgw-bolt-carrier-group-158-carpenter-sp-hpt-mpi?variant=3084070593


Barrel: Sons of Liberty Gun Works 16” 4150CoMOV 1:7 MPI HPT COLD HAMMER FORGED Barrel
Caliber: 5.56 NATO Chamber
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
Gas Block: .750″ Gas Block Journal with appropriately sized gas port
Weight: 19 Ounces
Barrel Finish: Phosphated Outside
Chamber Finish: Heavy M249 Chrome Lining
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 Cerra Forge forgings
Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, NiAc Seal
Contour is fully machined leaving no flash marks from the forging.
All lowers are cut with M16 auto pocket.
Safe, Fire, and Full Auto Pictograms.
Angry Patriot Roll Mark

Buffer System: Vltor A5 Buffer System designed to improve reliability while creating a smoother operating cycle.
Receiver Extension: Vltor A5 7 Position Receiver Extension Tube made from 7075-T6 Aluminum
Buffer: Vltor A5 5.8 oz. Buffer
Buffer Spring: Sprinco Green Rifle Length Spring
Receiver end plate: Standard Mil-Spec with properly staked Castle Nut

Fire Control Group:Sons of Liberty Gun Works Liberty Fighting Trigger  (LFT)

Safety Selector:
Sons of Liberty Gun Works Selector

Grip: MAGPUL MOE Grip – Black

Stock: Vltor IMOD Stock - Black

Upper Receiver:
Material: Made from Mil-Spec 7075-T6 aluminum Cerra Forge forgings.
Exterior Finish: Anodized to Mil-Spec MIL-A-8625F, Type III, Class 2, Hard Anodic Coating, Flat Black Dye, Non-Reflective, NiAc Seal
Interior Finish: Dry Film Lube
T-Marks: Engraved T-Marks

Charging Handle: Vltor Gunfighter Mod 4

Gas Block: Sons of Liberty Lo-Pro Gas block made from 4140 Steel and Nitride Treated

Gas Tube: Sons of Liberty Standard Mid Length Aluminum

Rail System: Sons of Liberty Gun Works Intrepid Key-Mod Rail system.
Weight: 13.9 OZ
Inside Diameter: 1.3" ID
Finish: Mil-Spec Type III Class 2 Hard Coat Anodizing per Mil-Spec Mil-Spec MIL-A-8625F
Barrel Nut: 7075 Barrel nut w/ Hard Coat Anodizing
Free Floating Design
Grade 8 Fasteners
Titanium Anti Slip plate
Anti Rotation- Anti Slip Design
No Special Tools Need for Barrel Nut
Continuous top rail design
Mil-Spec 1913 Mounting rails

Muzzle Device: ALG Single Chamber Brake

Sights: Front and Rear MBUS BUIS

Includes: Hard Plastic Case, Three Okay Industries Surefeed 30rd Mags, SOLGW Sticker & Patch, Trident Concepts TACOST card deck, copy of the US Constitution, and LIFETIME Warranty Certificate. 

Customer Reviews

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Sons Of Liberty Gun Works was founded on the principle of producing hard use, purpose built weapons for Americans in 2012. Our company was founded by two lifelong firearms enthusiasts and one US Navy SEAL. We produce a wide range of products including M4 based rifles and Mk10 Rifles, over take on the classic AR-10.  

All our products are backed by a LIFETIME Warranty.  We can do this because we believe in only providing products that we believe in and would stake our reputation on.  Our entire staff has been thoroughly trained by the best armorers in the proper procedures to build and diagnose problems with the M4 platform.  

We provide in house custom rifle builds, repairs, cerakote, special order of non AR Platform firearms, training on the AR platform and consulting work.  Come by and check us out, our doors are always open and the after hours beers are always cold.

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