FX Wildcat MKIII/FX Maverick STX Barrel Kit

STX System. Upgrade Accuracy. Ready to Shoot.

The FX Wildcat MKIII / FX Maverick STX Barrel Kit is a complete, drop-in barrel upgrade built around FX's proven Smooth Twist X (STX) system — delivering consistent accuracy with both pellets and slugs right out of the box. Whether you're changing calibers, upgrading your existing barrel, or optimizing for a specific projectile type, this complete kit gives you everything needed for a confident, precision-ready installation.

Overview

The STX barrel system is the foundation of FX's accuracy reputation — and this kit brings that proven platform to the Wildcat MKIII and Maverick in four caliber options. The pre-installed liner means the kit is ready to shoot immediately upon installation, and the complete package includes barrel, shroud, and pellet probe so no additional components are needed to complete the swap.

Key Features

• FX Smooth Twist X (STX) barrel system for proven pellet and slug accuracy
• Pre-installed liner — ready to shoot straight out of the box
• Complete kit includes barrel, shroud, and pellet probe
• Available in .177, .22, .25, and .30 caliber
• Supports interchangeable liner options for different projectile types
• Designed for easy installation and caliber swapping
  
  

Performance Advantage

• STX barrel system delivers consistent, repeatable accuracy with both pellets and slugs
• Pre-installed liner eliminates setup time — install and shoot immediately
• Complete kit format ensures no missing components for a clean, confident caliber swap
• Interchangeable liner support allows further optimization for different projectile weights and types
  
  

Compatibility

• FX Wildcat MKIII
• FX Maverick
  
  

Available Calibers

• .177
• .22
• .25
• .30
  
  

What's Included

• STX barrel with pre-installed liner
• Shroud
• Pellet probe