This is a RRA LAR-8 varmint that started w/a 26" bbl. I cut it off @ 16" and put a suppressor on it. Threads are 5/8x24. Also has a 3 way adj gas block. Gun shot well I just don't shoot it that much. Probably has between 300-400 rounds down it. Comes w/one 19 round mag. $1100 shipped to your FFL.