Its a smooth type of russian diakonov rifle grenade from wwI. It hase all parts and its possible to take it aparts.

No explosive substances

40.8-mm Dyakonov Rifle Grenade Launcher was designed in 1916 by Capt. Mikhail Dyakonov. It was successfully tested but due to Russian revolution and civil war it was not put into service until 1928 in a slightly improved version with better sights and improved range. The Dyakonov launcher was used by Red Army until 1942 when it was rendered obsolete. In 1944 a VKG-40 anti-tank shaped charge grenade was designed (“40” designating the caliber, not the year) and an attempt to revive Dyakonov launcher was made, but VKG-40 was not good enough