FX Impact M3 Smooth Twist X Superior Barrel Kit Tensioned 800 mm (Twist Rate 1:14)
 
This FX Impact Tensioned 800 mm barrel kit can be of great use when your FX Impact is used to shoot heavy slugs over long distances. The increased amount of thrust that is needed to launch a slug over long distances can cause an increase in barrel oscillation, which can negatively alter your shot pattern.
This tensioned barrel decreases these oscillations because it's more rigid and stiff compared to the original shrouded setup. Compatible with FX Impact MKI, MKII and M3 
The FX Impact Tensioned 800 mm barrel kit allows you to put your moderator right back on the ½ UNF muzzle thread again after installation.