Some of them are. It depends on what the Reaper's job is. Usually the guards are not (as strange as that sounds), but they can call the ones that are whenever they need to. Guards mostly just do firsthand spying to try to catch things the cameras might have missed. The armed Reapers are the ones that carry out abductions, and even they don't have very advanced weapons. They might have a billy club or a small gun like a pistol. They also carry cuffs in case of resistance.