Oh I have another sniper that does blatantly shoot through walls. I don't think it's op it's a perk of the gun. Like tracking rockets there are pvp weapons that are incredibly useful. I'm not justifying this but I've had my sniper since week 3 and no one has called me out yet because I use it as a sniper primarily. If someone is obviously creeping behind a wall I'll use the armor piercing to my advantage