OK, some hints for the remaining questions:
2. We've got the first part right, that firearams were probably first invented and used in China, but we're waiting for the approximate date. Hint: Some Chinese chronicals mention firearms use in battles stretching back to the 4th century in China, but these chronicals were written many centuries after the battles and they describe technologies that are far more recent in origin. There is no doubt that gunpowder has been used in China since the 4th century, but only in temple ceremonies as Knight-Dragon observed.
9. Charles VIII and all of Europe had a basic problem in the 15th century with firearms technology that he resolved. It would greatly widen the range and use of firearms...
11. You guys have already mentioned this development mistakenly as an answer to other questions. It really was simple, but had a major impact.
13. These two guys essentially invented the modern firearm.
14. Mauser was more famous for his pistols at the time, but he made something that was sloppy and prone to exploding much more sturdy and safe.
17. Peek-a-boo, I see you!
18 D. The Moisen-Nagant had a strange feature whereby the trigger guard was oversized, for a hand with big gloves to fit in it... (Now who would need big gloves...?)
18J. Piece o' crap, but a holdover from WW I - coming from the country that took to hiding behind "walls".
21. The shape of the magazines is a key...
Good luck!
2. We've got the first part right, that firearams were probably first invented and used in China, but we're waiting for the approximate date. Hint: Some Chinese chronicals mention firearms use in battles stretching back to the 4th century in China, but these chronicals were written many centuries after the battles and they describe technologies that are far more recent in origin. There is no doubt that gunpowder has been used in China since the 4th century, but only in temple ceremonies as Knight-Dragon observed.
9. Charles VIII and all of Europe had a basic problem in the 15th century with firearms technology that he resolved. It would greatly widen the range and use of firearms...
11. You guys have already mentioned this development mistakenly as an answer to other questions. It really was simple, but had a major impact.
13. These two guys essentially invented the modern firearm.
14. Mauser was more famous for his pistols at the time, but he made something that was sloppy and prone to exploding much more sturdy and safe.
17. Peek-a-boo, I see you!
18 D. The Moisen-Nagant had a strange feature whereby the trigger guard was oversized, for a hand with big gloves to fit in it... (Now who would need big gloves...?)
18J. Piece o' crap, but a holdover from WW I - coming from the country that took to hiding behind "walls".
21. The shape of the magazines is a key...
Good luck!