Reminder: If you ask an author any questions or attempt to provide “concrit” about their RT projects on this forum, you will be banned from the forum without discussion. Your desire to engage authors is understandable but there is no place on RT, not even the forum, where that kind of engagement is allowed.
http://world.guns.ru/index-e.html list of all military firearms by country and type. including sniper rifles.
http://www.thefirearmblog.com/blog/2016/02/14/tfbs-weight-omnibus-part-3-1-stragglers/ this is a weight omnibus of pretty much all common military arms. this is the last part because it links to the first three parts.
http://www.forgottenweapons.com/ great videos on rare guns with intelligent commentary that pretty much anyone can understand.