Huggett moderators are CNC machined from aircraft aluminum with stainless steel mesh and ballistic fibre inside. The design is very elegant but effective. This Standard Deluxe moderator is 17 cm long and is made to fit the FX models; Royal 300/400/500, Wildcat, Wildcat MKI and Bobcat. Suitable for caliber 5.5 mm / .22 and 6.35 mm / .25. This moderator does not fit the FX Impact.