Hi Spiridonov,
I have dedicated most of my life, some 30 years, to the intense study of earliest European hand firearms and related accouterments. As you too are deeply interested in this topic you might like to read some of my previous posts:
http://www.vikingsword.com/vb/search.php?searchid=12058
I am certain that you will find many interesting items and historical sources if you take your time.
Best,
Michael