The Firearm Blog has a series of articles identifying various sniper rifles used by various Brazil LEOs and Military
Part 1
http://www.thefirearmblog.com/blog/2016/12/22/brazils-sniper-rifle-part-1/
Part 2
http://www.thefirearmblog.com/blog/2016/12/23/brazils-sniper-guns-part-2/
Part 3
http://www.thefirearmblog.com/blog/2016/12/24/brazils-sniper-rifles-part-3/
From: The Firearm Blog