Extract the maps to the GMod maps folder and start them via the Garry's mod console. You MUST download and extract the texture & model pack to your GMod directory before playing.
=================================================== Title : SOF@L's SNIPERSNEST Description : An old Soldier of Fortune map made by SoF@L/INTRUDER converted to Halflife2 Release Date : 7/27/05 Version : Final Filename : SnipersNest-SOF1.bsp Aut