SOLGW M4-89 5.56 NATO Rifle - 13.7" Pinned Barrel HUXWRX

SOLGW M4-89 5.56 NATO Rifle - 13.7" Pinned Barrel HUXWRX

Built for warriors, trusted by professionals, and engineered for those who demand uncompromising performance—this is the M4-89 13.7 Rifle. Sons of Liberty Gun Works has poured decades of craftsmanship and combat-grade innovation into this rifle, delivering a weapon that’s ready for hard use straight out of the box. Whether you're defending freedom, training for excellence, or simply demanding the best, the M4-89 is your unwavering ally.

Featuring a precision-machined 13.7” barrel pinned to 16", a robust 7075-T6 aluminum receiver, and a tuned buffer system, this rifle is optimized for reliability, accuracy, and durability. Every component is built to exceed Mil-Spec standards, backed by a lifetime warranty and the SOLGW promise: no shortcuts, no compromises.

Own a rifle that’s not just built to perform—but built to last.

Combat-Grade Barrel
13.7” 4150 CrMoV barrel (pinned to 16") with 1:7 twist for superior accuracy and longevity.

Caliber Versatility
Chambered in 5.56 NATO for optimal performance in tactical and training environments.

Corrosion-Resistant Finish
QPQ-treated barrel and extension for enhanced durability in harsh conditions.

Mil-Spec Receivers
Upper and lower forged from 7075-T6 aluminum with hard anodized finish for rugged reliability.

Enhanced Buffer System
A5H2 buffer and SpringCo Green spring deliver smoother recoil and improved cycling.

Premium Fire Control
Liberty Fighting Trigger with a crisp 5.5lb pull for consistent shot placement.

Ambidextrous Safety
Quick Q Ambi Selector with Safe, Fire, and Full Auto pictograms for intuitive control.

Ergonomic Furniture
B5 Systems Bravo Stock and Grip in black for comfort and control.

Suppressor-Ready Muzzle
Pinned HUXWRX device compatible with FLOW series suppressors.

Lifetime Warranty
Backed by SOLGW’s commitment to quality and reliability.

Specifications

• Barrel Length: 13.7” (pinned to 16")
• Barrel Material: 4150 CrMoV per MIL-B-11595E
• Twist Rate: 1:7
• Caliber: 5.56 NATO
• Thread Pitch: 1/2-28
• Muzzle Device: Pinned HUXWRX (FLOW suppressor compatible)
• Gas Block Journal: .750″ with tuned gas port
• Barrel Finish: QPQ corrosion-resistant
• Barrel Extension: QPQ-coated M4 feed ramp
• Testing: High Pressure Tested (HPT), Magnetic Particle Inspected (MPI)
• Lower Receiver Material: 7075-T6 aluminum forging
• Lower Finish: MIL-A-8625F Type III Class 2 hard anodized, flat black, NiAc sealed
• Lower Contour: Fully machined, M16 auto pocket
• Safety Selector: Quick Q Ambi with pictograms
• Buffer Tube: Intermediate 7075-T6 aluminum
• Buffer: A5H2
• Buffer Spring: SpringCo Green rifle-length
• End Plate: QD Mil-Spec with staked castle nut
• Trigger: Liberty Fighting Trigger (5.5lb pull)
• Grip: B5 Systems Grip – Black
• Stock: B5 Systems Bravo Stock – Black
• Upper Receiver Material: 7075-T6 aluminum forging
• Upper Finish: MIL-A-8625F Type III Class 2 hard anodized, flat black, NiAc sealed
• T-Marks: Engraved
• Gas Block: Lo-Pro 4140 steel, nitride treated, knurled set screws
• Gas Tube: Mid-length melonited stainless steel
• Handguard: Upgraded M89 rail system
• Rail Weight: 13 oz
• Sights: Not included
• Included Accessories: Tactical soft case, three 30rd mags, SOLGW sticker & patch, copy of the US Constitution
• Warranty: Lifetime