MTM 40/45/10MM Cal 50 Round Flip-Top Ammo Box - $1.99 The P-50 Series is for those who prefer to keep their ammo boxed in 50s. These living-hinged boxes offer many of the same features of the P-100s only in a 50 round container. ASIN#: B0051L27TK Model number#: TO-COL B0013R8DCG P504510 P50-45-10