OK, if you AS A LICENSED BUSINESS, install a new barrel and no manufacturers name is on it, are supposed to stamp your business name on said barrel. Don't recall if caliber is required, at various times, armies of the world seem to have omitted that. Probably a good idea-see next paragraph.
However, in order to avoid hassles with regulatory agencies, some firms choose to err on the side of caution and go above and beyond actual legal requirements.
Again, if it's a DIY project on your own item, you do NOT-or at least didn't-need an FFL. In point of fact it used to be legal for you to build a gun for your own use from scratch without a license-assuming your state doesn't have laws affecting acquisition etc. However, should you ever decide to sell said gun, you now have a major problem as you didn't have a license to manufacture firearms.
The gunsmith shop at Colonial Williamsburg got into a hassle with the Feds over their manufacture and sale of flintlock rifles done as part of the living history exhibit. They didn't have a manufacturers FFL. It was finally worked out in some manner.
However, in order to avoid hassles with regulatory agencies, some firms choose to err on the side of caution and go above and beyond actual legal requirements.
Again, if it's a DIY project on your own item, you do NOT-or at least didn't-need an FFL. In point of fact it used to be legal for you to build a gun for your own use from scratch without a license-assuming your state doesn't have laws affecting acquisition etc. However, should you ever decide to sell said gun, you now have a major problem as you didn't have a license to manufacture firearms.
The gunsmith shop at Colonial Williamsburg got into a hassle with the Feds over their manufacture and sale of flintlock rifles done as part of the living history exhibit. They didn't have a manufacturers FFL. It was finally worked out in some manner.
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