FX
FX STX Superior Heavy Liner (Slug)
$120.99
LINER SALES ARE FINAL - NON RETUNABLE PRODUCT
*This liner is highly recommended in order to get the best results with heavier grain slugs. In our preliminary testing we have found this liner performs well will slugs needing a faster twist rate to stabilize.
The groundbreaking Smooth Twist X barrel liner has been further perfected. FX Airguns proudly introduces the new FX Superior Smooth Twist X Barrel Liner (or FX Superior STX). The new Superior STX barrel liners are still created using the patented way of pressing the rifling into the barrel from the outside; but this is now done with a higher degree of precision, lower tolerance, and some other slight modifications that result in a superior liner to the standard STX liners.
.25 – (1:16) Slug Liner
RESULTS ARE NOT GUARANTEED
FX
FX Impact | STX Slug Tensioned Barrel Kit
from $520.99
*SHIPS WITH HEAVY SUPERIOR SLUG LINER
The advancement of slug shooting and the enhancements to the FX Impact have shooters wanting to use heavier slugs at faster speeds. This requires a more rigid barrel to handle the additional energy and vibrations created by these projectiles. The new FX Tensioned Barrel System adds the firmness needed to let you reach the potential of the FX Impact with heavy slugs, all while maintaining the extreme accuracy everyone expects from an FX Airgun.
Conceived and created by the famed airgun engineer Hein Frommann, who perfected it through a global collaboration with Johan & Fredrik Axelsson (Sweden), Matt Dubber & Roelf Vorster (South Africa) & Ernest Rowe (USA). The result is really showing off the brain trust at FX Airguns.
From a barrel harmonics perspective, the tensioner system reduces the amplitude of barrel movement which results in better accuracy and more consistency. Secondarily the rigidness of the barrel becomes more temperature stable and will further hold zero regardless of conditions and to handle knocks to the barrel during hunting, PRS courses, etc.
800mm Barrel
To push the boundaries of what small bore slugs can do, FX is introducing an 800mm Slug Tensioned Barrel for the FX Impact. This barrel will allow the FX Impact to shoot heavier slugs at the speeds needed to create a higher BC which will allow the Impact to shoot at further distances.
All FX Tensioned Barrels allow the shooter to use a moderator. 1/2” UNF threads come standard on all but the .35 Calibers, which use an M18x1 thread. When installing the tension nut, tighten until the nut is flush with the carbon fiber housing, then tighten an additional quarter turn. Additional torque is not needed. Note: The tensioned barrel is not really needed for those shooting pellets as pellets use less pressure and produces less movement to the barrel (except for the .35 caliber that does benefit from the tensioner).
*In order to get the advertised velocities (40gr. slugs @ 1040 fps) you will need an 800mm Impact with Power Block, 720 Power Plenum, Pin Probe & Tungsten Hammer Weight.
FX
FX Impact | STX Barrel Kit (Smooth Twist X Superior)
from $442.99
*SHIPS WITH STX - Smooth Twist X Superior LINER*PROBE INCLUDED*MAGAZINES NOT INCLUDED
The Smooth Twist X Barrel is a fully rifled barrel liner. All barrel kits now ship with the STX Superior Liner. FX’s proprietary process of imparting the inner rifling of the barrel from the outside of the steel tubing leaves a flawlessly smooth finished rifling inside the bore. This in turn increases the accuracy of the projectile drastically and makes this a highly coveted barrel for any air gun enthusiast. These barrel kits will include the barrel, shroud & probe for the selected caliber. This barrel is housed in the Interchangeable Barrel system allowing the shooter to swap and change barrel liners of various twist rates, bore specifications and more; all to tailor the barrel to different projectile sizes. The standard barrel length is 600mm.
700mm Smooth Twist X-Barrel with Superior Liner
With the FX 700mm Smooth Twist X barrel, comes an exciting upgrade from the standard X Barrel. It is 100mm longer and provides higher accuracy due to its more efficient air consumption and stabilizing power imparted by the length of the barrel (available in both .25 and .30 caliber). The 700mm barrel can also be utilized to extract more power from the Impact for those using it in a hunting application. You can expect to gain up to 10% more muzzle energy from the barrel when tuned properly over the shorter standard 600mm X barrel.
Much like the standard FX Smooth Twist X Barrel, the 700mm barrel is housed in the FX Interchangeable liner system which allows additional barrel liners of varying twist rates and other specifications to be exchanged for different projectiles.
For those who wants to experience more power from their FX Impact or who are looking for an extra edge in their competitive shooting, we highly recommend the upgrade to the unrivaled FX 700mm Smooth Twist X Barrel.
FX
FX Wildcat/Maverick | STX Barrel Kit (Smooth Twist X Superior)
from $299.99
*SHIPS WITH STX - Smooth Twist X Superior LINER*PROBE INCLUDED*MAGAZINES NOT INCLUDED
With this complete barrel kit (Smooth Twist X Superior barrel) for the FX Wildcat MKIII and the FX Maverick you can easily change calibers. The kit consists of a barrel with fixed shroud, a STX Superior liner and a pellet probe. Available in several calibers.
FX
FX Crown | STX Barrel Kit (Smooth Twist X Superior)
from $299.99
*SHIPS WITH STX - Smooth Twist X Superior LINER*PROBE INCLUDED*MAGAZINES NOT INCLUDED
With this complete barrel kit (Smooth Twist X Superior barrel) for the FX crown you can easily change calibers. The kit consists of a barrel with fixed shroud, a STX Superior liner and a pellet probe. Available in several calibers.
FX
FX Solid Barrel Kit | 700mm
$359.99
Heavy Liner. Liner Lock. Three Transfer Ports.
The FX Solid Barrel Kit 700mm is a purpose-built barrel upgrade for serious FX platform owners who want to maximize long-range performance and consistency. Featuring a heavy liner, liner lock, and three interchangeable transfer ports for fine-tuned airflow control, this barrel kit gives you the foundation for a precision-tuned FX build across a wide range of compatible platforms.
Overview
The Solid Barrel Kit delivers a heavier liner profile for improved rigidity and reduced barrel whip — directly translating to tighter groups and more consistent shot placement at extended distances. The included liner lock secures the liner firmly in place, and three transfer ports give you the tuning flexibility to optimize airflow for your specific caliber, pellet or slug weight, and power goals. No pellet probe or shroud is included — the kit is designed to work with your existing probe and shroud.
Key Features
Heavy liner for improved barrel rigidity and reduced harmonic whip
Liner lock for secure, consistent liner retention
Includes three transfer ports for fine-tuned airflow adjustment
700mm barrel length for maximum velocity and long-range performance
Compatible with a wide range of FX platforms
Pellet probe and shroud not included — uses your existing components
Performance Advantage
Heavy liner reduces barrel flex and harmonic whip for tighter, more consistent groups
Liner lock eliminates liner movement for repeatable, accurate shot-to-shot performance
Three transfer ports provide airflow tuning flexibility to optimize performance for different projectile weights and power levels
700mm length maximizes projectile dwell time for peak velocity and long-range consistency
Compatibility
FX Impact
FX Wildcat
FX Maverick
FX Crown
Other compatible FX platforms
⚠️ Pellet probe and shroud not included. Use your existing probe and shroud with this barrel kit.
FX
FX Bull Barrel Kit | 700mm
$429.00
The FX Bull Barrel Kit 700mm is built to add mass and stability to FX air rifles equipped with a Dynamic MKI or Dynamic MKII block like the FX Panthera, FX Dynamic and FX King. The solid steel barrel housing is made of a massive 20mm diameter tube, increasing weight toward the muzzle and maximum stability with no flex. This added mass helps reduce muzzle rise during the shot cycle, allowing the shooter to stay on target and maintain a stable sight picture for faster follow-up shots.
The barrel assembly uses a screw-in design at the rear, with the STX liner system positioned inside the housing. A standard ½” UNF thread at the muzzle end allows the use of a moderator or muzzle brake, depending on the setup. The design is compatible with current FX Dynamic platforms as well as earlier models such as the FX Panthera, FX Dynamic and FX King.
Depending on caliber, the kit is supplied with a specific STX liner configuration. The .22 (5.5 mm) version includes a Superior Heavy Liner for slug use, while the .30 (7.62 mm) version features a Superior Liner. The STX Liner inside the housing is precision ground to achieve an accurate and tight fit in the steel housing. The liner system remains interchangeable, allowing configuration changes when required.
The increased barrel mass and rigid construction support more controlled shooting behavior, maximum stiffness and stability, particularly at higher power levels or when using heavier projectiles.
Key features:
Solid steel barrel housing, 20 mm diameter
700 mm barrel length for extended velocity and stability
Added front-end mass to reduce muzzle climb
½” UNF thread for moderator or muzzle brake
Compatible with FX Dynamic and Dynamic MKII blocks
Fits platforms such as FX Panthera, FX Dynamic and FX King
Interchangeable STX liner system
Application: Developed for serious shooters looking for maximum stability and reduced movement during the shot cycle, particularly when shooting slugs or at longer distances.
Air Venturi
Air Venturi | Avenge-X Caliber Change Kit, .22 Caliber
$69.99
$79.99
Air Venturi Avenge-X Caliber Change Kits transform your Avenge-X rifle into another caliber. It only takes 5 minutes to change your Avenge-X into .22 caliber. The kit includes a barrel, probe and standard capacity 10 round magazine. Use these interchangeable kits to quickly switch between small caliber plinking and larger caliber hunting!
Air Venturi Avenge-X Caliber Change Kit, .22 Caliber
22.8" Shrouded Barrel
Pellet Probe
Includes one .22 cal, 10 round magazine