Sons of Liberty Gun Works MK1 CAR SBR 5.56 NATO 11.5" SS Barrel - Black

Sons of Liberty Gun Works MK1 CAR SBR 5.56 NATO 11.5" SS Barrel - Black

Born from a relentless pursuit of perfection, the Sons of Liberty Gun Works MK1 CAR SBR is more than a firearm—it’s a mission-ready platform engineered for serious shooters who demand uncompromising performance. With its 11.5″ medium contour barrel, MK1-specific billet receiver set, and 10.75″ DriveLock rail, this weapon system delivers unmatched rigidity, control, and modularity.

Finished in Black Anodize, the MK1 CAR SBR is built to thrive in the harshest conditions. From its polygonal rifling and titanium barrel nut to its Liberty 2-stage trigger and NP3-coated Bolt Carrier Group, every component is selected for durability, precision, and tactical advantage. Whether you're clearing rooms or training hard, the MK1 offers maximum rail space, minimal deflection, and integrated cable routing—all designed to elevate your shooting experience.

Billet Receiver Set
Precision-machined upper, lower, and rail for unmatched strength and alignment.

MK1 DriveLock Rail System
10.75″ rail with 7-sided MLOK slots, laser texturing, integrated cable routing, and continuous 1913 Pic Rail

SS Medium Contour Barrel
P3 Stainless Steel 11.5″ barrel with 3-groove polygonal rifling for enhanced accuracy and heat management.

Titanium Barrel Nut
Space-age coated for superior thermal control and long-term durability.

Enhanced Ergonomics
Enlarged mag well, optimized bolt catch fencing, and low-snag control surfaces for faster manipulation.

Advanced Buffer System
A5H2 buffer with SpringCo Green Spring and 9-position A5 receiver extension for smoother recoil.

Premium Fire Control
Liberty 2-stage trigger (4.5 lbs total) for crisp, predictable breaks.

Ambidextrous Controls
Badger ambi selector and MK1 maritime bolt release for left- or right-handed operation.

Liberty Charging Handle
Small latch design for snag-free, reliable charging under stress.

Lifetime Warranty
Includes Critical Use Replacement for peace of mind in any scenario.

Specifications

• Caliber: .223 Wylde / 5.56 NATO
• Barrel Length: 11.5″ Medium Contour
• Barrel Type: P3 Stainless Steel, 3-Groove Polygonal Rifling
• Barrel Thread Pitch: 5/8x24
• Gas System: Carbine Length
• Muzzle Device: HUXWRX
• Rail System: SOLGW MK1 10.75″ DriveLock Rail
• Receiver Set: SOLGW Billet Upper & Lower
• Finish: Black Anodized
• Trigger: Liberty 2-Stage (4.5 lbs total)
• Bolt Carrier Group: NP3 Coated
• Charging Handle: Liberty Small Latch
• Safety Selector: Badger Ambidextrous Safety
• Buffer System: SOLGW A5 Receiver Extension (9 Position), A5H2 Buffer, Proper Buffer Spring
• Magazine Well: Enlarged for faster reloads
• Magazine Release: Enlarged fencing for tactile engagement
• Bolt Catch: MK1 maritime bolt release
• Ejection Port Door: Rapidly serviceable design
• Picatinny Rail: Continuous top rail with maximum slot count
• Anti-Rotation Dowels: Dual stainless steel for rail stability
• Warranty: Lifetime with Critical Use Replacement
• Build Quality: Individually assembled and test-fired