Transportal Gun

A special gun that only uses one bullet. The canister that holds the bullet will always withdraw it back to the gun through a portal after it has been shot, either automatically or manually, no matter where it is. This essentially eliminates things like the need to carry ammunition and reloading, as well as leaving shelling or other traces, like the bullet being stuck in a target. However, if the bullet is destroyed, it cannot return, which has led people to seek upgrades to it and customized bullets.

The most powerful of these weapons have indestructible bullets, but they cost a fortune, as does the weapon. It will accept and adapt to any type of bullet, but still functions to hold only a single bullet, and cannot withdraw it if it is destroyed.