Underwood Ammo Xtreme Penetrator 9mm Luger +P 115gr Solid Monolithic Handgun Ammo - 20 Rounds - Underwood Ammo combines their trademark power and precision with Lehigh Defense masterfully designed Xtreme Penetrator bullets - the result is one jaw dropping round. This round is solid copper and features a unique nose that maximizes penetration and facilitates consistent and reliable magazine feeding.