Cabin4 - A smith could chop a Win 92 down to 12 inches but it would take a BATFE permit and a $200 NFA tax to own it as it has become a "sawed off rifle". The company that makes the "new" Mare's leg has built them from the ground up as a "lever action pistol" and can be sold without the permit as a regular handgun.
So it sounds like it could be done but the $200 extra BATF tax cost might make it financially not reasonable. Still curious what a smith would charge for the job. The other point might be, you have an old lever gun laying around so the $350 cost to buy a used one is not part of the calculation. Just interesting and thanks for the insight.
Most gun smyths won't touch that job and you would have to have it sent to those that have (I believe,haven't had my java yet
) a Class 03 license to build an SBR. Most are fairly reasonable with their prices from what I recall when I last checked with prices going ~$45 but this would have extra work to move the magazine band and reblue. The barrel may be tapered which would cause some additional work/fitting.
In the end, it would be simplier to get the Mare's Leg, go the trust route to get the tax stamp on the Form 1, and fit a stock once the tax stamp is in hand. Getting a 5320.20 for interstate travel with it isn't a problem unless you're trying to take it to a nonpermissive state.
As for the 'practicality' of it all, a carbine is always more accurate and faster on target than a pistol. Period. Especially with multiple shots that would be required for multiple perps in a home invasion. A 12" carbine is highly mobile and gets more velocity(hence KE) out of a pistol caliber cartridge than a 4" pistol does.
I'm not going to get one since I've already got a couple 11.5" AR15 SBR's and have one that is out of the safe at night by the bed. There has never been anyone charged for using a legit registered NFA weapon in self defense. If it is a righteous self defense shoot, then it is a righteous self defense shoot. Those that claim contrary are challenged to post linkage to the incident. Also, on my ATF Form 1's in block 4i, I put as the reason, "
SELF DEFENSE, HUNTING, COMPETITION, AND ANY OTHER LEGAL REASON". So if questioned at the grand jury hearing on why I shot little Johnny Nogood with such an 'evul black rifle' whose baby ain't done nuffin and was going to turn his lifes arounds, I can respond that a federal regulatory agency had previously approved its use in self defense.
Always remember that FDR wanted the 1934 NFA to apply to all firearms.