in 45 ACP and all I have to say is wow!!! This gun is soooo much fun to shoot. I was thinking of buying it in 9 MM for cheaper ammo but decided on the 45 for a liitle more kick and I'm glad I did. I tried buying one on-line at Bud's but they said they wouldn't ship it to Suffolk or Nassau counties in New York so I ended up buying it local to me at a store around the corner. This is a solid feeling carbine and way easy to break down for cleaning. I like the open sights but thinking on puting one of those holographic sights on it. Can'y wait for Saturday off to the range again!