.223 with the 9 twist barrel. Shoots RL15 and 75 gr. A-max's very well. Gun is in great shape. Comes with a 50 round ammo box, 42 rounds of once fired, and 8 rounds of virgin Winchester brass. All brass was annealed when taken out of the bag. I can be reached via text @ 970-520-9820 for those who are seriously interested. I will forward pics of rifle , brass and 100 yard targets. Will come with a set of weaver bases also. This rifle has the old style trigger installed. $800 shipped. No trades at this time. Cross posted.