Ok .. after seeing the S&W MP15/22 for sale on here and wishing I could win the lotto, I noticed a post where someone said they just purchased an upper for $300. Now ... that has me wondering if this S&W can be turned into a regular .223 AR?? I was not aware of that if that's true. Can someone please tell me more about these guns? Have I been mislead in believing these are only .22LR capable with no swapping of parts?? This is just a .22 designed to look like an AR correct?