The .22 FX Impact shroud is 31.4cm closed and 39.5cm extended over a 19 inches long barrel (length used by the pellet). Approx 16cm of the barrel is inside the shroud, and the shroud starts at around 32cm of the barrel length (I count only from the transfer port's end). The shroud extension overlaps the fixed section. When the shroud is closed the gap between where the fixed shroud starts and where the extension starts is 3.4cm. And when the shroud is extended the fixed section shows 11.5cm under the extension. The length of the extension section is 28cm including a retainer ring.