M4-76 Rifle with Wedge Lock Rail CUSTOMIZABLE

Now: $684.00
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Custom Rifles Ship in 2-8 Weeks




16" 4150CrMoV Barrel
M76 Wedge Lock Rail
Magpul SL Stock
Raptor-LT Charging Handle

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 M4-76 is the newest addition to the Liberty Series, featuring our brand new M76 Wedge Lock Rail.  The M76 features a Steel Barrel nut and rock solid Wedge Lock locking system. The M4-76 also features our Liberty Fighting Trigger, Raptor-LT Ambi Charging Handle and awesome Vltor A5 buffer system, for the Ultimate Fighting Rifle.  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-SL. 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:


Barrel: Sons of Liberty Gun Works 16” 4150CoMOV 1:7 MPI HPT 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: 27 Ounces
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 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: Intermediate (A5) Buffer System designed to improve reliability while creating a smoother operating cycle.
Receiver Extension: Intermediate Receiver Extension Tube made from 7075-T6 Aluminum
Buffer: A5H2 or EH-1 Buffer
Buffer Spring: Sprinco Green Rifle Length Spring
Receiver end plate: QD Mil-Spec with properly staked Castle Nut

Fire Control Group: Sons of Liberty Gun Works Liberty Fighting Trigger (LFT) with consistent 5.5lb pull.

Safety Selector:
Sons of Liberty Gun Works Selector

Grip: MAGPUL MOE Grip – Black

Stock: Magpul SL 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: Raptor Ambi -LT

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 Standard Mid Length Melonited Stainless Steel

Rail System: Sons of Liberty Gun Works M76 Wedge Lock
Weight: 13 OZ

Muzzle Device: Mil-Spec A2 Flash Hider

Sights: Front and Rear Magpul MBUS

Includes: Allen TacticalSoft Case, Three OKAY Industries Surefeed 30rd Mags, SOLGW Sticker & Patch, copy of the US Constitution, Steel M-LOK QD Socket and LIFETIME Warranty Certificate

Additional Details


1 Review

  • 5
    My new favorite rifle

    Published by Cory B on May 24th 2019

    This is a very well-built rifle. Moves in front of my KAC SR15 and LMT MRP to my favorite AR. The VLTOR A5 system with A5H2 5.33 oz buffer and green Springco are tuned nicely with the gas system to give a nice ejection pattern, positive bolt lock, and smooth operating cycle. You can see/smell Aeroshell 64 moly grease thread treatment was used on the RE, barrel nut, and muzzle device threads. When I see that, I have confidence it was built right. The SOLGW RE plate with QD socket is nicely made; I’ll be using these on any builds I do going forward. RE nut is staked well. BCG is awesome - carrier key is staked HARD and bolt is marked HPI/MPI. The rail is excellent - Hodge Defense designed wedge lock with anti rotation pin...best rail on the market. Gas block dimpling is nice and deep as can be seen by set screw depth. The upper and lower lock up very tight, but still allow the takedown pins to move freely once past the detents. The anodizing on the upper/lower are awesome. Deep black with nice uniform appearance. If you want that “we just dragged your rifle behind our truck prior to shipping” anodizing look, you’ll have to buy one with a pony on the side. This thing is beautiful. I’m impressed with the quality of this rifle, and it runs great. Highly recommended.

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