M80A1enbloc February 12, 2018 at: 1500 × 844 In: $13 a Shot: US Army’s New 7.62mm XM1158 ADVAP Round Costs HOW MUCH!? ← Previous Next → The XM1158 ADVAP is based on the design of the M80A1 EPR, but features a tungsten – rather than steel – penetrator. Seen here are eight rounds of M80A1 clipped together with a little bit of anachronism.