Well a local shop had quite a few PSA stripped lower receivers in stock... So I figured it wouldn't be a bad idea to pick one up. I already have an AR. A Smith&Wesson M&P, upgraded to my liking's with a UTG Pro free float hand guard, Magpul ACS-L stock, a Weaver 1-3 scope, and a few other things. I've got it right where I want it. Now the question arises of what to build with my new lower... I already have an AR exactly how I want it. So I don't feel the need to duplicate it again. What are some of the crazy builds going on right now? I might be open to the idea of a pistol build, or a rifle build. I wouldn't mind a different caliber as long as it works with AR mags and isn't too expensive to buy/reload for. My only requirement is that it needs to be reasonably practical and no quad rails. I want to hear your ideas... wild or mild.