Montana X-Treme Bore Polish and Cleaning Compound is a powerful solution designed for tough cleaning challenges, effectively tackling rough bores, rust and stubborn copper deposits. When used alongside Copper Killer, this bore polish can revitalize accuracy in older sporting or military surplus rifles. For new rifles with rough bores, our bore polish ensures a quicker and more thorough cleaning, helping them achieve peak performance with minimal effort. Keep your firearms shooting their best with Montana X-Treme.