For another tool in the tool box perhaps a suppressive fire weapon, high mag capacity, semi auto rifle with easily found ammo/parts, like an AR 15 such as affordable S&W M&P Sport or an AK 47 variant.
An AR-15? Why that’s an assault weapon, isn’t it? ;)
I loved the M16 when I was in the military 1983-88. They had fixed most flaws, and if you kept your weapon clean, no problems.
I was an expert. Maybe I should get one.