Let's say theoretically that a full blown race war breaks out tomorrow. All nons start slaughtering Whites and the police/ FBI/ FEMA/ Palantir starts rounding up White dissidents to put in concentration camps.
Your goal is to survive as long as possible and take out as much of the racial enemy as possible in your CURRENT location. I know Americans like to have massive gun collections of 100+ pieces but you can't carry that much on your person. So let's be realistic and focus on weapons you could realistically carry on your person or in your car.
For me I'm stuck in a medium sized city. Half the population is nons, large police presence.
Sidearm: S&W M&P2.0 9mm
Primary: HK417 .308
Backup: B&T APC9
Grenades: M67, smoke, molotovs
Force multiplier: FPV drones
This is my stack. Sidearm is a last resort. Primary is a battle rifle to more effectively fight pigs in body armor and drop nogs with one shot. The SMG is for softer non targets when I don't want to waste .308. FPV drones to take out APCs, helicopters, and other enemy vehicles.
I would probably go with a silenced AR-7 with subsonic rounds. There's even a pistol version that can go with it. But any .22LR rifle can do the job.
https://en.wikipedia.org/wiki/ArmaLite_AR-7
Too many mass shooters end up dying carrying too many guns and carrying too much ammo in open view of cameras.
Better to fire two shots and drive off before anyone understands what happened.