You don't. You cannot legally manufacture firearms without a Type 7 FFL. Additionally, you'd need the appropriate NFA tax stamp to be able to manufacture short barreled rifles and shotguns.
No
410 is not a gauge. 410ga
yes
What is the value oof a .410 gauge shotgun
A "410" is the smallest gauge of shotgun.
Yes, the Model 37 Featherlight was made in .410 and 28 gauge
The nominal bore of a .410 shotgun is.410 inch. Which is why it is properly called the .410 bore instead of the .410 gauge. In Europe it is sometimes called the 12mm, which is an inaccurate designation as a .410 bore has an actual diameter of approximately 10.4mm by metric measure. If the .410 had been named in the traditional fashion, by the number of lead balls .41 inch in diameter needed to make one pound, it would be about a 67-68 gauge.
Depends what your using it for hunting is the 12 gauge pump shotgun for home defense handgun
All my research indicates that browning never offered the auto-5 shotgun in .410 gauge.
There have been several handguns made that fire .410 shotgun shells- most recently the Taurus Judge. By the way, .410 is actually a caliber of shotgun, not a gauge. A .410 shotshell is about 67 gauge- but no one uses that designation.
Nothing.
A 410 is a little light for a self defence load. Go with the 20 gauge.