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