Sons of Liberty Gun Works PRESSCHECK M4-89 5.56 AR-15 Rifle - 14.5"

Available exclusively at PrimaryArms.com, the Sons of Liberty Gun Works x Presscheck Consulting M4-89 SF Carbine represents the pinnacle of performance and operability in a duty carbine.

With over 26 years of active service in Special Operations and Special Mission Units, Chuck Pressburg is an undisputed authority in modern tactical methods and training. His extensive combat experience, combined with his contributions to USASOC Research & Development, gives him a unique and nuanced perspective on the modern fighting carbine. This collaboration with Sons of Liberty Gun Works reflects his idealized duty rifle—a balance of mobility, precision, and uncompromising reliability.

More than your average AR-15, this rifle is built from Pressburg’s own select parts list, presenting the fine-tuned performance of a custom-built firearm.

Upper Features:

• 14.5″ Criterion CORE Mid-Length 1:8 Barrel
• Surefire Closed-Tine Flash Hider Pinned & Welded
• SOLGW M89 14″ MLOK Drivelock Rail
• SOLGW Upper w/ FA
• SOLGW BCG
• SOLGW Liberty Charging Handle
• SOLGW Gas System
• SOLGW/Presscheck Barricade Stop
• Magpul Dust Cover

Lower Features:

• LaRue MBT 2-Stage Straight Bow Trigger
• Forward Control Designs Bolt Catch
• SOLGW Angry Patriot Rollmarked Lower w/ Presscheck Laser Engraving
• SOLGW A5 Buffer Tube System – A5H2 & Sprinco Green Spring
• SOLGW 50* Quick Safety Selector
• Magpul K2 XL Grip
• Magpul SL Stock
• Magpul Magazine Release
• Includes Case and (3) Mags

The upper receiver is built around a 14.5” Criterion CORE Mid-Length 1:8 Barrel with a pin-and-welded SureFire Closed-Tine WARCOMP for enhanced balance and control. The 14” M89 Drivelock handguard is lightweight yet rigid, with extensive mounting space across full 90-degree M-LOK slots, forward 1 o’clock and 11 o’clock slots, and a continuous 1913 top-rail. To ensure optimal reliability, this rifle features SOLGW’s own proven mid-length gas system and BCG, as well as SOLGW’s ‘Liberty’ Ambidextrous Charging Handle for greater control under stress.

The lower receiver is SOLGW’s Angry Patriot receiver with a unique Presscheck engraving and enhanced components from LaRue, Sons of Liberty Gun Works, Forward Control Designs, and Magpul. Optimized for speed and precision, the included LaRue MBT 2-Stage Straight Bow Trigger is set for a 4.5 lb pull with smooth travel and a short reset. The buffer system is A5 length with an A5H2 weight and Sprinco Green spring. The stock, grip, and magazine release are all from Magpul, while the bolt catch comes from Forward Control Designs.

In conclusion, the Sons of Liberty Gun Works x Presscheck Consulting M4-89 SF Carbine stands as a testament to unparalleled quality, exquisite craftsmanship, and an impeccably curated parts list. Focusing keenly on delivering optimal performance and reliability, this M4-89 SF Carbine represents the pinnacle of innovation and expertise, making it the top choice for those who seek the best in the world of AR-15 rifles.