Boomstick UL-I Barrel Back – Multiple Colors

Accuracy DYE-versified. The DYE UL-I Barrel Insert System has reset the standard for accuracy, versatility, and performance. Now available in Black, Clear, Gold, Red, and Blue, each in Dust or Polish finish—all in one place.

The UL-I’s extended 8.5” control bore uses multi-stage precision honing for unmatched consistency. A self-aligning three-piece design ensures perfect centering between the barrel back, insert, and tip. The signature muzzle brake delivers progressive porting, optimized harmonics, and an ultra-quiet shot.

Compatible with the PWR insert system, this insert-ready barrel back gives tournament and recreational players the edge they need to dominate on the field.

Key Features:

• Interchangeable Inserts: Compatible with 9 bore sizes (.676–.692)
• Precision-Machined Fit: Ultra-consistent, air-tight insert seating
• Superior Accuracy: Perfect paint-to-barrel match for cleaner shots
• Air Efficiency: Optimized bore = more shots per tank
• Toolless Changes: Fast insert swaps with a self-clamping design
• Autococker Threaded: Fits most major markers