223 ammo, so if you fire 6000 rds a year of say, 14c a round cruddy 223, you probably need a new ($100) barrel, and you've spent $840 on ammo. the guy who fired 5000 rds of .22, and 1000 rds of Winchester bulkpack ball spent about $200. $900 will buy a whole BUNCH of .22 units, or one unit and a good 223 suppressor, to include the $200 tax.