Step 1. Test gun. Test fire several shots. A chrono/pop can chrono test will give you a rough idea of FPS. If it is low, run. If it is high that may mean an upgraded spring, on stock internals, it could blow the gun up.
Step .2 PAINT. AVOID IT. Unless they are professional painters, you should run the fuck away from paint. All it takes is a bad miss spray an you got paint somewhere it shouldn't be.
Step 3. Extras. Take the value of the gun, new, and knock off 30%. Then do the same with the accessories. Accessories can make guns look more expensive then they are.
Originally Posted by TokyoSeven
1+1 = 2
Were you maybe expecting 1+1 = donut?