Sup guys. I had a 5.56 AR a while back that I had a ceiner 22 kit in and it was great fun. I switched to a 5.45 S&W upper and ditched the ceiner kit because I was told it wouldn't work. But now that I think about it, I'm wondering why it won't work? The 5.45 use the same BCG, just the bolt is different. The lower hasn't changed at all. Will the .22 not work in the 5.45 barrel? Any help is appreciated.