hello ... as you requested the skin for P90 in here http://www.gamebanana.com/skins/111862 , well you can download it from here :
Install Notes :
- unrar with 7-Zip or WinRAR .
- you need to have the default weapon models in your game folders , as inside the archive i have placed only the 2 .vtf's .
- read the content from the 'read.txt' file to know where to place them .
- enjoy !
NOTE : - this is only from the example i used ... since you've wanted the example HD skin .