There is no way to 100% prevent it from being stolen, and that's something people will have to consider when they decide to make that purchase. There are already many other things there is no way to 100% prevent about guns.
Do you agree with charging everyone with a stolen weapon with an equal charge, regardless of what the weapon is used for?
Of course this ignores the fact that there is literally NO WAY to 100% prevent something from being stolen.
And sure, charge everyone with a stolen gun with an equal charge. But make it a good one.