Garry's Mod

Garry's Mod

Half-Life SWEPs
Opposing Force MP5 and SPAS 12 world models?
Is it possible to make replacements for the default HL1 MP5 and Spas-12 to be replaced by the slightly higher quality models from OPF? I have the game in question but I don't know where to begin since it's unlikely that Upset does requests for these sorta things.