HL2 default weapon models

Does anyone still have their default HL2 weapon models? Because I just got the MadCows pack and the ironsights for the HL2 weapons are all f’d up with the custom models i use. Or could I just port them straight from my HL2 folder? I’m not sure about that because of the engine differences.

Delete whatever custom models you have. Your normal models will restore automatically.
Try doing a clean install otherwise, because they might be in some folder that you’d never find.

Thanks much!
Trying it now.