Shadow Systems MR/XR 9mm 4.5″ Threaded Fluted Barrel

The Shadow Systems MR/XR match barrel is a 9mm, 4.5″ threaded, spiral-fluted barrel finished in black nitride. It includes minor design improvements intended to promote more consistent lockup without compromising reliability. The chambers are fully supported and can be fired with hot P ammo and lead bullets. The barrel uses a common 1/2×28 thread pattern and is compatible with Glock 19 (Gen 1–5) frames.

Key Specifications

• The caliber is 9mm.
• The barrel length is 4.5″.
• The thread pattern/fit is 1/2×28.
• The barrel type is Threaded & Fluted.
• The finish is Nitride.
• The model designation/fit is MR/XR.
• Compatible with G19 (Gen 1–5).
• The rate of twist is 1-in-10″.
• The country of origin is US.

This match-grade, spiral-fluted threaded barrel provides MR/XR owners a durable, precision-oriented upgrade for everyday carry and competition use. Its nitride finish and fully supported chamber construction prioritize long-term durability and reliable function across a wide range of commercially available ammunition.