Genuine FX Smooth Twist X (STX) barrel liner — the factory-standard liner system used across FX Impact, Wildcat, Dreamline, and Crown platforms. FX rifles the liner using its patented outside-in pressing process, producing tight bore tolerances and consistent shot-to-shot performance for pellets and slugs.

Drop-in replacement for existing FX STX barrel kits — supplied as liner only (no barrel kit included). Select your caliber, barrel length, and twist rate below.

Note: FX has revised twist rates across production runs over the years. Twist rates listed here reflect current factory-standard specs; confirm against your specific barrel kit generation if precision slug work is critical.

To find the twist rate of your desired liner, please CLICK HERE to go to the FX website interactive liner menu!