Please be more specific with a question
"Had" is past tense.Had is the past tense of have.
No
"Had" is the past tense of "have." "Had" is used when referring to possession or ownership in the past, while "have" is used for possession or ownership in the present. For example, "I had a dog when I was a child" (past possession) vs. "I have a cat now" (present possession).
You have defined it. It is a hobby (past time, recreation, if you like) that encompasses the acquisition of firearms for knowledge, use, and potential to make money.
Browning has made one in the past
To many variations over the past 100 yrs to answer.
Iben Browning has written: 'Rocky Mountain Almanac 1990' 'Past and future history' -- subject(s): Climatic changes, Popular works
Yes, had is a verb. It's the past tense of have, to be precise.
Dozens of companies and thousands of individuals have made firearms over the past 700 years
Hundreds of books have been written on firearms history. No way to answer the question here.
No, it has been decreasing for the past 20 or so years.
Violence involving firearms has been DECREASING for the past 20 years.