Why don't you guys put it in your car and lock it?
The other thing is do not put your initials on the bolt or anything like that. I mean, is someone Really going to disassemble their gun and show you the back of the bolt just because you "think" it is yours. If you put more than 1000 into your gun I am sure you can get it annoed or milled. If you put less than 1000 then just do something to your gun more obvious like scratch your name into the back of the grip frame or at the bottom of your guns body. On my gun I have my name on the feedneck and the bottom of the body, along with a note for whoever would steal it inside the grip frame. On my old spyder
I milled in my name with a razor on the side of the beavertail.