Caio Junqueira uses 2 handguns in the movie: a Glock, and a Taurus PT-92. The Glock could be a Glock 19, 23 or 25. It's most likely a Glock 25 in .380 ACP.
A chopped and converted Heckler & Koch HK94A3 is used by Captain Nascimento in several scenes, as noted by its lack of paddle magazine release and barrel lugs, and the metal lower receiver.
The INA Model 953, the Brazilian version of the Danish Madsen M50 SMG. Recognized by its stamped metal body which, literally, is held together by the barrel nut (which was known to come loose on its own, spilling the internal mechanisms on the ground). Brazil manufactured it in .45 ACP instead of the standard 9mm.
Captain Roberto Nascimento (Wagner Moura) carries several guns through the movie. One of them is an Colt SP1 with M16A2 hand guards, the rifle carried by most of the men of the BOPE in the movie.
An IMBEL Fz M/964 (FN 50-00 Brazilian license-build fixed-stock version) is used by the drug dealers as well as a DMR by at least one of the BOPE officers and a standard configuration by another.
In the opening scenes, Caio Junqueira opens fire with an unidentified scoped rifle. It might be an Imbel AGLC, but I can’t identify it with certainty. It's maybe IMBEL M/968 (old Czech or Belgian Mauser enhanced with new 0.308 barrel in the 60's).
IMBEL M968
The new BOPE recruits can be seen training with the M968 and other brazilian-made variants of the Mauser M908.
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