its usually a hammer action
Actually, it means a couple of different things. The term action can refer to the internal parts that make the gun cycle, feed, and fire, or it can refer to how the handgun works.
A double action gun is a gun that has two trigger modes. The trigger is long and heavy, then the gun stays cocked and the subsequent trigger pulls are short and light.
A double action only gun is a gun that has a long heavy trigger every time.
A single action gun is a gun that must be hammer cocked before it can fire.
Whether it has a hammer or not is not directly related to what type of action it has.
Yes.
You have to state whether it is a handgun, rifle, or shotgun and then whether it is a bolt action, semi-automatic, single action, double action or pump action.
Can't be answered withou knowing if you are referring to a rimfire or centerfire 22
Old gun catalogs
Do not attempt. Best left to a trained gunsmith.
frame, barrel, sights
Florida does not require handgun registration, so the answer is, you don't. If you are referring to a permit to carry, check with a local gun range. They should be able to tell you how to go about it.
That question can't really be answered as asked. What papers are you referring to? Are you referring to a purchase? A transfer? Manufacturing? Reparing? Something else?
Herter's was an importer, not a manufacturer. No published sn data on what they imported.
Inexpensive turn of the century handgun
I take a guess at this: If you're referring to 45 GAP, the term GAP stands for "Glock Automatic Pistol."
When referring to mental anxiety the terms are used interchangeably, but when referring to physical action upon a mass the terms do not to the same action.