M4-89 13.9″ 6.5 Grendel
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 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 are meant to be used hard and go in harm’s way, they won’t let you down.
All rifles are test fired twice in the shop to ensure proper function.
The M4-89 is our premier fighting rifle, featuring a 13.9″ Stainless Steel Match barrel, A5 buffer system, MBT Trigger, and B5 furniture. At Sons of Liberty Gun Works we always tell our customers, it’s 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.
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 13.9” 416SS 1:8 MPI HPT Barrel
Caliber: 6.5 Grendel Type 2 Chamber
Barrel Steel: 416 Stainless Steel
Twist Rate: 1/8 Twist Six Groove
Thread Pitch: 5/8 x 24 Threaded Muzzle
Gas Block: .750″ Gas Block Journal with appropriately sized gas port
Barrel Finish: QPQ Corrosion Resistant Finish
Barrel Extension: NP3 coated M4 Feed Ramp Extension
High Pressure 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.
Hidden lowers are cut with M16 auto pocket.
Safe, Fire, and Full Auto Pictograms.
Various Roll Marks
Buffer System: Enhanced A5 Buffer System
Receiver Extension: 9 Position Loyal 9 Receiver Extension Tube made from 7075-T6 Aluminum
Buffer: A5H2 Buffer
Buffer Spring: Sprinco Green Spring
Receiver end plate: Quick Detach End Plate with properly staked Forwards Controls Design Castle Nut
Fire Control Group: LaRue MBT 2 Stage Curved
Safety Selector: Sons of Liberty Gun Works Ambi Selector
Grip: B5 P23 Grip
Stock: B5 Bravo Stock Black
Upper Receiver:
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
T-Marks: Engraved T-Marks
Charging Handle: SOLGW Liberty Charging Handle (Ambi)
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: 13″ Sons of Liberty Gun Works M89 Drive Lock Rail system.
Weight: 15 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: Steel
Free Floating Design
Grade 8 Fasteners
Anti Rotation- Anti Slip Design
Includes Steel QD MLOK
Continuous top rail design
Mil-Spec 1913 Mounting rails
Muzzle Device: NOX .300
Sights: None, Optics Ready
Includes: Tactical Soft Case, One Steel M-LOK QD Socket, One SOLGW Steel 24rd Mag, 2oz Bottle of S.P.E.C. 76 Lubricant, SOLGW Sticker & Patch, copy of the US Constitution, and LIFETIME Warranty Certificate
