223 penetrator ammo generally is constructed with a steel rod inside the lead round. These 223 or 5.56x45 rounds are preferred by some AR-15 shooters looking for a good self-defense round because of penetrating rounds' ability to break through light body armor. Look for in-stock rounds for sale from known manufacturers like Federal, PMC and Federal American Eagle.
1000rds - 5.56 NATO PMC X-TAC 62gr. Green Tip Penetrator Ammo