The sport is dominated by the AR-15 style rifle, but if you own a magazine-fed semi-automatic rifle and have an optic bolted on it, you can compete. It’s that simple. Sure, there are refinements that help—a better trigger, muzzle brake, extended bolt release, extended bolt handle, and other modifications, but don’t get hung up on them. Just take your gun to a few matches and get your feet wet. Later you can modify that gun or, more likely, buy a dedicated rifle for the sport with all the latest features.