MG34 cleaning can

German machine guns were commonly supplied with soaking cans for muzzle components the make cleaning easier. The soaking medium was kerosene, referred in the German literature as Petroleum. The practice went back at least as early as the MG 08.  The MG 34 soaking can was designed to hold the recoil booster assembly, which consists of the flash suppressor, recoil booster housing, and recoil booster cone.