I have an old HILTI gun DX 100L. It still has the old metal carry case and some safety cartridges in their tubs.Although it's old I'm told it still works. But I'm wondering if it's ok to sell it..are there any laws about selling these sort of old tools? I don't need it at all..it was left by my ex and I've just found it on clearing out. If I could sell it how much should I ask? Any help appreciated.