Patrol Upper Magpul SL Customizable

Now: $549.76
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(2 reviews) Write a Review
Custom Uppers ship in 2-8 weeks.


M4 Patrol Upper SL

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.

The Patrol Upper Magpul SL is our entry level carbine build. It is built with all high quality components. 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 Patrol Upper. We have built our guns to run through years of hard use, and we have nothing to hide.

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: 29 Ounces
Barrel Finish: QPQ Corrosion Resistant Finish
Barrel Extension: QPQ coated M4 Feed Ramp Extension
High Pressure (proof) Tested (HPT)
Magnetic Particle Inspected (MPI)
With "F" marked Front Sight Block 

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

Gas Block: "F" marked steel Front Sight Block, taper pinned to barrel per milspec.

Gas Tube: Sons of Liberty Standard Mid Length Melonited

Handguard: Magpul MOE SL, Mid-length, Available in Black, FDE, Gray, or OD Green

Muzzle Device: Mil-Spec A2 Flash Hider

Sights: Rear Magpul MBUS, matching handguard color.

Additional Details


2 Reviews

  • 5

    Published by Nick on Sep 26th 2019

    This upper is rock solid similar to a pipe wrench. Accuracy and quality emanate from it.

  • 5
    Patrol upper with sl handguard

    Published by Ryan Rohm on Feb 18th 2019

    Ordered my upper and about 8 days later was told it was ready. I was very happy about how quickly it was completed and the quality of the product was amazing I wouldn't expect anything but the best from solgw they will definitely be who I send friends and family to for m4 parts and service

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