QB79 with cheap (800-850PSI output) Ninja tank would work. With NO work, are likely to be in the same power range as a stock fully pumped Benjamin 392 (or the old 342 or even older 312, or the old Crosman 101). That level of power (something between 12 and 14 foot pounds) has been working for 30-40yard squirrel hunters for something like 80-85 years. With an HPA QB79, you'd do all the pumping (with a hand pump) ahead of time, easily able to mount a scope, and shoot something like 140-180- shots before having to refill (although if you work some mods and are careful with adjustments, might get a little over 12 foot pounds for 200 shots per fill).