FX Bull Barrel System

Built to add mass and stability where it matters most — at the muzzle — the FX Bull Barrel System is a heavy-duty upgrade for FX air rifles running a Dynamic MKI or MKII block, including the FX Panthera, FX Dynamic, and FX King. In place of the standard thin barrel tube, the Bull Barrel uses a solid steel housing roughly 20mm in diameter, shifting weight forward to reduce muzzle rise during the shot cycle. The added front-end mass helps keep the rifle steadier through recoil, so you stay on target and get back on aim faster for follow-up shots.

Inside, the housing carries FX's STX liner system, precision-fitted for a tight, consistent bore relationship that supports accuracy and improves harmonic stability compared to a standard barrel setup. The barrel screws in at the rear for a secure fit, and a standard 1/2" UNF thread at the muzzle end accepts most moderators or muzzle brakes.

Key Features

• Solid steel barrel housing (~20mm diameter) for added front-end mass and stability
• Reduces muzzle climb for faster, more stable follow-up shots
• STX liner system for consistent, precision-fitted rifling
• Screw-in rear barrel assembly for a secure, repeatable fit
• 1/2" UNF muzzle thread compatible with standard moderators and muzzle brakes
• Fits FX Dynamic MKI and MKII blocks — compatible with FX Panthera, FX Dynamic, and FX King
• Caliber-specific liner configuration available

NOTE - Barrel is bare steel - not black. Current bare metal barrel shown in listing photos