I didn't make it!
If anyone of u has finished the HL2 single player, u might have noticed that there is a better version of the gravity gun in the last levels ... Now, i just set up the Hammer editor for HL2 and tried to find out how to make this weapon. I looked in the .bsp files in the entities but i didn't found out how to do this weapon. Also i typed "impulse 103" or so (the one to find out the entities name u aim at) aiming at the gravity gun as it was lying on the ground and it said "weapon_physcannon" so the triggers somehow have to change this weapon. Does someone know how to do this? ty for all ur replies and sorry for my bad english (i'm german) :D