Here we go again! A 45 colt can be fired in a 410 gauge shotgun, providing the choke is cut out. Does this make it an illegal gun? The 45 Colt designation makes it a handgun and the 410 designation makes it a shotgun. The Shotgun, firing a single or multiple projectile was definded in 1968 as was....the destructive device. If Joe Shmo made a handgun prior to 1968, called it a handgun and labeled it as a handgun.....it was a handgun. Whether it fired a 410 shotgun shell or not is another issue......hence, the language of 1968 G.C.A. To give you an example, a Contender Carbine and an Encore Carbine are not handguns but can be made into one easily. This, as you know, brought on the debate of the late 80's in Federal Court. Every firearm manufacturer made so many variants of different products and try to think how many employees somehow, came into posession of prototypes. There is no convincing you and it's obvious. Since Chamber adapters won't allow the projectile to touch the rifling when firing a 22 in a 410, does this make it a smooth bore rifle, aka 22/ Four Tenner by Savage? I am tired of debating this subject.