Assault rifles, which are protected by the Second Amendment. But that’s besides the point. Real revolutions aren’t like in sci-fi dystopias, with an unflinching authoritarian government and a military that obeys every order to mow down rows of civilians. There are competing political factions, and the military is just ordinary people who will do some things for the government, but who will break ranks if pushed too far.
For example, the French Republicans didn’t march into a field and square off head-to-head with the royal army. They stormed the Bastille to get the weapons there then caused a bunch of ruckus: https://en.m.wikipedia.org/wiki/Storming_of_the_Bastille. What followed was a complex mix of political events and violence that led to the downfall of the monarchy.
A more recent example: Bangladesh won its independence when fighting caused Bangladeshi members of the Pakistan military to defect. The hostilities then drew in military support from neighboring India. But you can’t start the war if all you have is kitchen knives.