Ah yes, the Minishark from Terraria.
At least, a 3D rendition of it.

So this is one of the 3D renditions of Terraria's Minishark weapon by Tedwin Knockman, which you can see some more detailed renders here.

Includes:
lambda_group\tedwin66\terraria\minishark\terraria_minishark.mdl
lambda_group\tedwin66\terraria\minishark\terraria_minishark_magazine.mdl

Credits :
Re-Logic - Creator of Terraria.
Tedwin Knockman - Original creator of the model.
NeoLin - Porting to Source.
Fennecai - PBR to Source Converter