OK, so a dude at the range had a tac solutions upper that he liked. Looks fun and it's cheap as shit. Well I was looking at spikes and see that their dedicated .22 barrels sit 1.5" back in the rifle. So your barrel looks like a M4 14.5 only at 16". http://www.spikestactical.com/z/index.php?main_page=product_info&cPath=72_73&products_id=122 So what if instead of rocking a 16" you turn one down to 13 1/2" or so and pin a KX3? You'd have basically have the feel of a 12" sbr with a 16" barrel and no tax/entry into the crazy people file. SOMETHING IN THE BAALL PARK OF THIS -> THEN TOSS IN A FOLDING STOCK http://www.spikestactical.com/z/index.php?main_page=product_info&cPath=78_36&products_id=347 WHAT DOES OT THINK?