Chalk this up to my professional life spilling over into my hobbies. I've seen conversion kits that turn an AR-15 into a rifle that fires a .22 round and after trying it out I'm convinced that it's a great training aid. The only problem is the ballistic properties of the .22 are no where near the same as they are on a .223 or 5.56 round. Another common problem I seem to run into is not having a long enough range to practice on. With a little bit of inspiration, I think I solved both problems with one tool.