hex

i down loaded a hex for the ar2 and the model was changed and i dont know how to change it back

Easy, just go into your gmod folder and delete the folowing files,
/garrysmod/models/weapons/w_IRifle
/garrysmod/models/weapons/w_IRifle.dx80.vtx
/garrysmod/models/weapons/w_IRifle.dx90.vtx
/garrysmod/models/weapons/w_IRifle.phy
/garrysmod/models/weapons/w_IRifle.sw.vtx
/garrysmod/models/weapons/w_IRifle.vvd
/garrysmod/models/weapons/w_IRifle.xbox.vtx

The custom replacement may not have the w_IRifle.xbox.vtx that is okay just delete the files that do exist.

thanks for the help, im new