Hey guys. I would like to purchase a rifle that can hurt someone without taking out my shoulder/half of my body. I've shot an M4 standing, prone, and kneeling with pretty good accuracy. However, I want something with a bigger caliber and more powerful. Is there anything out there that I can look into? Let's say I don't live in California, so there are relatively few restrictions. I'd prefer to buy something with a piston system. Budget isn't a concern, because I'm willing to save up and research for a good gun. I'm not new to the gun world, but I would like some additional help. Thanks.