is this possible?

Hello, i’m making a swep, i’ve see some that have “custom holdtypes” for example the old zoey’s tf2 weaps

i want to make somehitng like this, if it isn’t possible, at least, holding it like a pistol but with one hand

You didn’t find a picture with a bit better quality?

I noticed though, that in GMod 13, you hold pistols in one hand.