Haven't heard of Portal? Valve's super-duper awesome sauce Portal shooting FPS? Well, if not, Steam have a sale if you're interested - it might be on sale there over the next five days, if you do know what it is - the real life replica is being auctioned off for charity.

Harrison Krix's used his own two hands to create a handmade replica of the gun in 2009 and now has an updated model. How do you get your grubs on it? Well, at auction - it's for a good cause too, it will be held on December 7th - at a Child's Play Charity event in Seattle.

The winner's auctioned amount will go to Child's Play (a gaming industry charity dedicated to improving the lives of children with toys and games in a network of over 60 hospitals worldwide) and of course you get your hands on a one-of-a-kind Portal gun.

You could possibly use it to pretend shoot portals at the bottom of people's feet. Possibly.

And, as a bonus, a video!