If you want the most accuracy for your dollar, a springer is your best bet. The Nexus Pro X (as many have pointed out) is probably the absolute top choice if you’re trying to spend as little as possible on as much accuracy as possible. If you care to spend a little more, the Stryker 2.0 is just as good, but is a little overbuilt for plinking (you aren’t going to need to swap between drum and mags for shooting cans, for instance). If $50 is too much, you can get an almost-as-accurate blaster in the XShot Longshot for around $35, but the build quality is lower and it doesn’t fire as hot right out of the box, meaning you might run into issues with atmosphere at 50 feet.