I seriously doubt publishing monographs on guns being a way to make money. At least, not an effective way. Printing out a PDF book of a few hundred pages on computer, paper + ink easily costs $50+ per copy, not including binding yet, let alone the distribution cost.
Those books were printed on high quality thick paper, beautifully bound under hard cover..... and two-digit retail price...... Does that sound like a good way to make money??
You say "no, it's not two-digit price. It's $200 or $300". DWM only made a few Reich Marks per gun, but those DWM guns are commonly listed above $1000 today. The profit does not go into DWM's pocket.
Probably publishing a book on "Effective Home Defense by Glock" can make more. Market is bigger
