Had the marvel 22lr conversion on the 1911/45acp for awhile and was burning a brick of ammo a week in it since the beginning of april. Just pulled it off and put the 45acp slide back on. Got a couple thousand rounds of blammo ammo to burn up. Between the 3 calibers (22lr/9mm/45acp) I burn 15,000 to 20,000 rounds a year in the the 1911's. And just for the heck of it I picked up a plastic/steel hybrid. A ruger MK IV 22/45, the one with the plastic lower designed after the 1911. Only got 1500 rounds thru that 22/45 so far.