Specwar with probably 1k rounds of steel case 223, 750rds brass 556, 200 rounds of match quality 308, a few hundred 22 magnum, 100 or so 7.62x54R. Use of brake and flash hider on all calibers. Probably 300 or so rounds of fully auto 556. 16" barrels generally but it's been on a 20" and a full...