Currently flying somewhere over the Atlantic and available to order is this boxed MGC Calico. 

This is a NBB gun with a gas tank stored in the pistol grip, which is good for hundreds of shots without the need to refill, it's incredibly efficient. The replica is fed via a large hopper system, simply unscrew the cap at the top, and pour in over 500 bbs and you're good to go. Don't expect a MK23, but a fun plinker and people have been known to add modern hops to these...

£195 to your door.