Canada

Yeah, just infantry, we are talking about rocket launchers, anti-tank grenade launchers(RPG famously), LMG, manpads. Then you have things you can mount on a truck, then you have vehicles itself...

So admittedly I know next to nothing about this stuff, but you can make RPGs if you're dedicated. The IRA did it. IEDs will also get you pretty far.

I might be wrong, but that person's argument seems to be about the individual owner's paper on preserving our sovereignty, independent of the calibre size.

By low-power I meant things you can get legally, so not sniper rifles and shit.

You also have support from other countries and people, sharing resources, and intelligence. You do not resist USA or Russian with just a bunch of minutemen with walmart weapons. Even harder if they do not care for civilian lives.

You might have some success disrupting some logistics in the partisan life, but not without a considerable support from modern military and allies.

The Irish and Algerians did it.