(Was £95) UNKNOWN MACHINE GUN BARREL JACKET

This is a unknown origin and period Machine Gun Barrel Jacket, the diameter measure 11cm on this when closed and 20cm long, I'm unable to find out exactly what it is and what it is for, but the feedback I'm getting is it must be for some sort of large MG like the MG08 possibly, so you could possibly getting a bargain hence the price as I'm not 100% on this item.