Have any of you seen the shotguns that attach under the barrel of a AR-15 like a grenade launcher? When I first saw one, I figured it would be neat to have, but it wouldn't be civilian legal as shown, as the shotgun barrel would be too short. Sure you could register it as a sawed off for a price of $200 and the 4th Amendment, but if anyone here knows me, you know that I'm not afraid of long barrels and heavy weight. So give the shotgun an 18" barrel and you'd be legal. But the shotgun barrel would stick out, especially if you used the AR-15 carbine. So I'd want a longer barrel, and if the shotgun is the legally requisite 26" and starts in front of the magazine, then the rifle barrel would probably have to be at least 24". Then I got to thinking that would be a pretty heavy attachment and a lot of stress on an AR-15, which many of us believe is underpowered, so I figured why not use a FAL instead? You can get decently long standard barrels which are threaded and either install a compensator or a barrel extender and weld or pin it. I'm sure this would weigh in pretty high, but you'd get the firepower of a full powered rifle AND the versatility and power of a pump shotgun. Any suggestions or any of you think I'm on crack?