Yes, .825 to .850. However the AAC-SP is threaded so it's natural smaller at the threads and .850 at the shoulder + or - a few thousandths. I can check it with a mike if you like. It's laying on bench in the shop.
Guns are not dangerous! People are! RKBA!
Last edited by Jerry45; December 3, 2013 at 01:42 AM.