It`s a fully compacted bullpup PCP rifle. Available in two different barrels and an air cylinder lengths 450 mm / 230 cm3 and 550 mm / 290 cm3. Standard calibers for Kozak FC are 4.5 mm and 5.5 mm (.177” and .22”). That gun has an internal sound moderator. The 1/2 UNF thread at the barrel`s end allows to add an additional silencer. Power output depends on length of barrel, caliber and a factory adjustments (7.5 - 44 J). Available in black or brown stock colours.