The reason to move is the state is willing to disadvantage in state manufacturers versus out of state manufactures.  

BTW, automotive springs are made by the zillions so spreading the cost of equipment is doable.  Also there warranty and liability reasons for marking that benefits the manufacturer and the customer.

A specialty maker like this does not have the volume and marking provides no benefit to the manufacturer or the customer.  

All the arcana of making guns and gun parts are relatively easily understood by anyone with a moderate degree of mechanical skill and relatively easily done by such a person with a drill press, lathe, and milling machine.  That person might not make a spectacular product, but it will work.

But a few questions to the person nonetheless.

What stats can you provide about home invasions where the homeowner fired 8 shots and the invaders kept coming?

Can you provide examples-- preferably more than a single datum, that  when a person shoots two of eight assailants, yet the other six decide to keep coming?  

Can you find the amount of monetary damage was caused by the firing of multiple rounds of ammunition in a residential area? This one probably will not be available. not terribly important to what we're speaking about, anyway.

Now, my thoughts:

If you can't shoot at better than 30 percent under pressure, you're better off with a sword, a baseball bat, or a crowbar. Use the bat's end or knob as a thrusting weapon, and aim for the solar plexus, the eyes, the crotch, the shins, in that order. With an aluminum bat, you can generate enough thrust to take the fight out of someone. If you've missed 4 times out of 8 at an oncoming, then grab the pistol or the rifle by the barrel, and apply the weapon topically to the assailant. You obviously have no use for a firearm, but you may be able to strike with a club. Before you get shot,stabbed, or whatever, you should be cause at least a nasty bruise on at least one assailant.

With 30 percent accuracy, you're more likely to hit your neighbor's house across the street than an assailant.

Volume of fire does not, I repeat NOT mean that, "Gee, whiz, if I put enough bullets down range, somebody's falling down!" In my experience, spread over three continents, numerous islands, and just about every conflict and/or police action since Vietnam (Kosovo and any other Balkan conflict excluded), the idiot who fires multiple rounds winds up firing most of them in a climbing arc, whether either a pistol, a semi-automatic or an automatic weapon (crew served weapons mounted on pintles, bipods or tripods excluded).

If someone's 15 feet away and you haven't hit them yet, you may as well run, because you're about to be in a world of pain, unless you have Chuck Norris-like skills.

People, the vast majority, do not have either the training or the expertise to use these weapons effectively, yet claim they are needed for self-defense with huge magazines. I carried a .45 caliber pistol and an M-16 in combat. I did not use multiple by this read more than two at a time) rounds to hit my targets.If I missed with two, then the adversary I was shooting at had usually taken cover or moved out of my line of sight. that adversary had been stopped from his attack. Think about it-- just as effective as someone running away, because, for that moment, and possibly for a lot longer, the adversary was out of the firefight. He may come back, but he may stay in cover. Someone rarely if ever returns to the fight in domestic situations, Q.E.D.

If one of my soldiers had been blazing away in the manner you describe-- unless I had called for covering or suppressive fire-- I would have butt-stroked him firmly in the helmet to get his attention for not showing fire discipline.

As to police or anyone else armed with a handgun, if the range is outside of 20-25 feet, or 7-8 meters, you'd better have a lot of practice id you want to make sure you hit where you're aiming. Given the general lack of training, practice, and fire discipline of the average citizen and criminal, getting shot from outside of 15 feet remains unlikely.  

Pistol-craft, or rather pistol practice designed to inflict damage upon an adversary, is a skill that requires a lot of practice. There's more to shooting someone than simply buying a pistol with a 14 or 15 round magazine or a rifle with a 20 or 30 round magazine.

Feel free to believe in yourself. I'm not questioning you. But don't draw conclusions out of made-up premises and then get self-righteous.

There's more to self defense or home defense with firearms than simply target practice at the range, unless one practices sleeping at the range and waking up being able to fire within two or three seconds. There are distractions like light, dark, screaming, dogs barking, other noise distractions, line-of-sight interruptions by noncombatants or civilians or even one's spouse, children, parents or grandchildren, depending on the situation. One should even sounds of rifle and pistol fire, since you're speaking of armed adversaries with, apparently, a limitless supply of ammunition.

Brother-in-law and sister-in-law don't make the cut.

THE PROVISIONS OF THIS SECTION DO NOT APPLY TO:
...

A TRANSFER THAT IS A BONA FIDE GIFT OR LOAN BETWEEN
IMMEDIATE FAMILY MEMBERS,WHICH ARE LIMITED TO SPOUSES,PARENTS,CHILDREN,SIBLINGS,GRANDPARENTS,GRANDCHILDREN,
NIECES,NEPHEWS,FIRST COUSINS,AUNTS,AND UNCLES