I have decided I want an AR. I am going to build one so that I can stay within my monthly budget. I am buying it slowly piece by piece, and then gonna have a friend help me build it. I bought a S&W stripped lower at The Outdoorsman in Greenwood and am wondering if it is 5.56 and .223 or just .223. They said because I am building it I can do either, but I also know they are a business and looking to sell stuff. Can somebody please help me with this. I would also like to know if there is a list of all the parts needed floating around out there for an AR build. As I said I am new and not entirely sure what all is needed to complete this build. Last does anybody know where I can get a cheap lower parts kit that is going to function well enough for targets/coyotes? Thanks in advance.