This is a legit working Physics gun from Garry's mod in doom, don't believe me then fine.
The mod is made by - MrRaveYard
He owns all the codes from this weapon in general.
The model in the game is from - VALVe (Half-life 2)
and the weapon is made by - Garry :D (Garry Newman)
The weapon is then reconstructed by - Me (Tabijaky)