Physgun Reskin Help

How do you reskin the physgun? Iused the physgun Replacement and extracted it into addons and it didnt work.
Heres the Link for the reskin:

It doesn’t go in Addons, place it in garrysmod/garrysmod/

Just replace the texture file(s) I guess?

No texture files are kept in the Garrys Mod directory, they’re all kept in the corresponding game .gcf files.

Hmm… You’re right.

Thank you

ok it wont work now what do i do