To get father grigori's gun, you have to be in the part in ravenholm when he throws you the shotgun. Save before you do this, as it will take more than one try. Roll a grenade on the roof near the corner closest to father grigori's platform just before the grenade explodes, jump towards his platform and the grenade will shoot you up. Before he throws the shotgun, walk on his gun. It is a regular shotgun skin, but shoots like a magnum. Also, the icon says "shotgun" as well as having the shotgun picture.

~note~ this trick works on the orange box if you are not invincible, but you can't pick up his gun.

B,x,y,a,o,,b,y,x,a

Up, up, down, down, left, right, left, right, B, A