For an AR that is. I'm thinking about investing in one. I don't have a .17 centerfire. Wouldn't hurt to add one to my collection. Have a whole box of .223 brass I can resize and make 17-223 out of. I just wondered if any of y'all could suggest a barrel I could put on a cheap AR I hardly ever shoot. Don't guess there's any sense in having a perfectly good rifle sitting around not putting holes in fur.