There are all sorts of things besides guns that a militia would need to deter a tyrannical government from oppressing them.
One is intelligence monitoring. If we don’t know what tyrants are trying to do to us, we can’t react in time when they attempt to seize power and turn the tables on us. Part of this means FOIAs, preventing the government from concealing plans against their own people with tools like Signal, and the protection of government-critical journalism like Institute for Justice, Project Veritas and now O’Keefe Media Group. The same goes for huge companies like Alphabet, Meta, Apple and Microsoft - anybody who if they boot somebody from their services, it amounts to major social and economic ostracism should be treated similar to government and be restricted and monitored similarly.
Another is drones and signals intelligence. These are not usually considered arms, but they can absolutely facilitate armed self-defense.
Likewise 3D printing and CNC milling machines, which California is trying to monitor and ban because of spooky guns. It’s very obviously an infringement on 2A to ban these machines, even though they themselves are not guns.