Gun safes are mandatory in Australia. They do not necessarily need to be bolted down. Everyone of the millions of Australians who have a privately owned, registered firearm stores it one - either at home, at a rifle range or another location. An 8 gun safe with a 2mm thick steel body and 3mm door measuring 360x1500x340mm weighs 55kg, so delivery to upper floors is not a problem. I know because I delivered a dozen or more of them.A big problem with the secure-your-guns measures is that the left always tries to go too far--mandating storage requirements that are simply impossible for many people. Only mandate simple locks--not big gun safes that need to be on solid ground and bolted down. (Something unavailable to anyone not living on the lowest level of their building, or with a crawl space under their floor.)If you can't get people to voluntarily secure their guns in a locked cabinet or safe, and you can't make laws to prosecute gun owners who fail to secure their weapons, then you aren't ever going to get people to accept access controls built into the guns themselves.
In Australia it's a case of no safe storage, no gun. It's a bit like mandatory helmets for motorbike riders; If you claim you can't wear one - say for medical reasons - you can't ride a bike. Works for millions of Australians.
That's acceptable to me--it's enough to keep it from readily developing legs, but not prohibitive. The problem is both sides have ceased to be reasonable about things, basically all proposed gun legislation is unreasonable in one direction or the other. A sane middle ground gets attacked from both sides.