whm1974
If I remember correctly what my gunsmith told me, the mounts by themselves are just regarded as "machine parts" — no problem.
Incidentally, in some states of Australia, you can only carry a firearm in a vehicle, disassembled, unloaded, in a locked box which is in turn securely chained or otherwise fastened to your car. Farmers going from one part of their farm to another, using a public road, even just crossing over it from one side to the other, have to comply with this rule.
In some clubs, because of state laws, shooters between details can not put their rifles or shotguns in a rack; they have to be locked away "securely" in a vehicle between shooting.
It's illegal for me to possess ammo (or even unprimed brass for that matter) for a firearm type I don't have on my licence — for me to be caught with, say, a fired .308 case would be an offence, because I don't have a .308 on my licence.
It's illegal for me to tell my wife where I have hidden the keys to my gun safe. The court has ruled that if she knows that, she is deemed to be "in possession" of my firearms — which is, of course, highly illegal for both her and me.
ALL firearms, even 500-year-old antiques, have to be stored in a safe/gun cabinet or "strongroom". If you want them on display, you have to have them rendered "inoperable". (Read: welded solid or a steel plug hammered into the barrel; thus, naturally, destroying any historical value they once had)
An air-operated arm is ruled as a "firearm". BB guns and airsoft are prohibited weapons. Paintball is illegal.
Enough??