FX Impact STX Slug Tensioned Barrel Kit

Rigidity. Reduced Harmonics. Built for Slug Performance.

The FX Impact STX Slug Tensioned Barrel Kit is a precision-engineered barrel system designed for shooters who are pushing the limits of slug performance from their FX Impact. Using a tensioned barrel design to reduce movement and harmonics, this system delivers the rigidity, consistency, and stability needed for precision shooting at distance with heavier slugs at higher velocities — representing a refined, globally-developed approach to maximizing modern airgun performance.

Overview

As slug shooting continues to evolve, increased energy and velocity demand a more stable platform than standard barrel systems can provide. The Tensioned Barrel System addresses this directly — the tension design reduces barrel movement and dampens harmonics for improved shot-to-shot accuracy and repeatability, especially with heavy slugs. Better temperature consistency and retained zero make this a genuine long-term accuracy investment for serious slug shooters. An 800mm extended option is also available for shooters who want maximum velocity, improved BC performance, and extended long-range capability.

Key Features

• Tensioned barrel design for increased rigidity and reduced barrel movement
• Reduced barrel harmonics for more consistent shot-to-shot performance
• Optimized for slug shooting with heavier projectiles at higher velocities
• Improved temperature consistency and retained zero
• Moderator compatible — standard 1/2" UNF threading
• .35 caliber uses M18x1 threading
• 800mm extended option available for increased velocity and long-range performance
• Developed through global collaboration for refined slug performance
  
  

Performance Advantage

• Tensioned design reduces barrel flex and movement under the increased forces of high-velocity slug shooting
• Reduced harmonics produce more consistent barrel behavior for tighter, more repeatable groups
• Improved temperature consistency means your zero stays true across changing field conditions
• 800mm option maximizes projectile dwell time for peak velocity and improved ballistic coefficient performance at extreme distances
• Retained zero under demanding conditions gives confident long-range slug shooting performance
  
  

Installation Notes

• Tighten tension nut until flush with carbon fiber housing
• Add an additional 1/4 turn after flush
• Do not overtighten
  
  

Compatibility

• FX Impact (moderator compatible)
• .35 caliber (700mm and 800mm) requires new Power Block
• Standard 1/2" UNF threading / M18x1 for .35 caliber

⚠️ Optimized for slug use. Not required for standard pellet shooting — though .35 caliber benefits regardless of projectile type.

⚠️ .35 caliber versions (700mm and 800mm) require the new Power Block.

⚠️ Not compatible with older .35 caliber FX Impact models.

⚠️ High-performance setups may require additional supporting upgrades.