Hellseher - looks like a mix of the "HK G3 SG1" (barrel and magazine) and an "HK PSG1" (Grip and stock)

Taurus - IWI TAR-21

Mapinguari - Carl Gustav M3 (M/86)

Chainbreaker - Model is based on the QBZ-95 (also called "Type 95")

Basher - HK-21

Guardian - M2 Carbine (since it can fire full auto)

Colpo - possibly the Benelli M4

Herstal - FN FAL

Dragonmaw - IWI Negev LMG

Serrano - IWI Uzi

Jararaca - Madsen Machine Gun

Lancehead - Beretta M12 SMG

Uru - possibly a Brasilian made copy of the Beretta M12

Rattlesnake/Viper - HK MP5 variants (MP5SD2 / MP5A2)

Maurus/Constrictor - possibly Brazilian made copies of the MP5

Zugred you absolute legend have me steam points

This is from what I could identify, Be advised that there will be a bunch of yapping:

• Brazilian made and "Brazilian" made firearms.
  Leo - Taurus PT92 - Brazilian Beretta 92, M975 is the military designation.
  Thunderbolt - Imbel MD1 GC - Brazilian M1911, customized with a slide charging handle.
  Serrano - Uzi - Israeli Uzi, no Brazilian variants were produced but regardless they make sense being here given its popularity. Upon further research, the name Serrano is a reference to Antonio Serrano from Rapid Fire, a 1992 martial arts action film, who uses a Micro Uzi.
  Lancehead - Taurus M972 - Brazilian Beretta M12 as the MT12, designated as the M972 by the Brazilian military.
  Uru - Mekanika Uru - Brazilian submachine gun by Mekanika, modified with an integrated foregrip to look similar to the Lancehead. I cannot find anything about Mekanika other than they also made a machine gun called the Uirapuru. Interestingly, this gun is one of the general inspirations for illegal homemade submachine guns in the country, hence why they are used by the Southern Front.
  Maurus and Constrictor - FAMAE SAF - Chilean submachine gun used by Federal Highway Police and Military Police of Sao Paulo State. This gun also appeared in Black ops 6 as the "Kompakt 92".
  Injector - Imbel IA2 - Brazilian Assault rifle used by the Brazilian military
  Taurus - Tavor TAR-21 - Israeli Assault rifle produced under license by Taurus, only small numbers were issued to soldiers in the Frontier brigade, hence the legendary rarity.
  Guarani - Imbel AGLC - Brazilian Sniper rifle. The suppressed version is likely based on the Remington Model 700 with an integral suppressor, unsure if the AGLC could be modified with an integrated suppressor.
  Knockout - Taurus ST12 - Brazilian Tactical Shotgun, not much is known about it on the internet it seems.
  
• Non-Brazilian made firearms.
  Herstal - FN FAL (Full Stock vers.) and ParaFAL (Skeletonized Stock vers.) - The Right arms of the free world, both used by the Brazilian military
  Zubeknakov - AKM - duh, its everywhere ig
  Arbalest - FN Ballista - Belgian sniper rifle, Arbalest is a larger crossbow with a greater force similar to a Ballista except way smaller.
  Oakbear - M1911 - america.
  Shockwave - Mossberg Shockwave - Short american shotgun, semi automatic variants exist. Wreck havoc, boost your notoriety, and unlock your inner bruiser bull!
  Calango - AR-10A4 - American battle rifle used by the BOPE.
  Insurgent - AMD-63 - Hungarian AKs, name comes from its common users, being insurgents and militia groups.
  Mauserka - Zastava M76 - Serbian marksman rifle name means "mauser rifle" in serbian?
  Snubnose - Rossi Model 88 - could be any kind of snubnose revolver, i just picked the one that looks similar.
  Basher - HK21A1 - German machine gun used by BOPE, the only HK gun you get to slap in this map....
  Raketnik - RPG-7 - Popular among militia groups, get yours now for only 849.50 Russian Rubles! (thats 10 dollars)
  Nykorev - PKM my beloved
  Masterkey - Stoeger Coach Gun - your average farmer gun, or the perfect choice to slaughter demons with.
  Guardian - M2 Carbine - American carbine that should NOT be chambered in "Medium Ammunition" as the gun is chambered in .30 carbine, a light round. The gun and magazine take up more space than it should.
  - A little fun fact: The M1 carbine is still used by the BOPE.
  Chainbreaker - QBZ-95 - Experimental weapon taking the form of the Chinese QBZ-95
  Mapinguari - Carl-Gustaf M3 - named after a mythical creature of the same name in Brazilian folklore, used by brazilian military
  Thumper - M79 Thumper - Thwomp, yeah its used by the brazilian military
  Hellseher - PSG1 - name translates to "Clairvoyant", no you dont get to slap it.
  Grizzly - Barrett M82A1 - .50 BMG American goodness,
  Colpo - Benelli M4 - Italian semi-automatic shotgun used by Brazilian Military. Looking up what the name meant jumpscared me and gave me a laugh
  Viper and Rattlesnake - MP5A2 / MP5SD2 - Iconic submachine guns by H&K, the MP5 is used by the Military and Navy, while the SD is used by the BOPE. most disappointing part is that you don't get to slap it either.
  Dragonmaw - M249 SAW - American Machine gun that lost its raid and belt fed privileges. While it is possible for it to use AR Stanag mags, it is not reliable due to potential feeding issues. These are usually used for emergency situations. While Zugred is wrong about it being the Negev, it would've been a far better choice considering the Negev's reliability with Stanag mags, and also its usage with the military police.
  Insignia - FN Five-seveN - Belgian pistol, oddly used by the police in-game, better suited as a coalition drop.
  Jararaca - Madsen machine gun - Danish machine gun from 1902 that found its way in the hands of the BOPE for some reason, the Police and Military are the only confirmed users.
  - The Military retired this weapon in 1996 but the Civil Police of Rio de Janeiro favored this antique for its reliability and intimidation and continued to use this weapon in 2018 despite plans of retirement in 2008.
  - The name comes from a highly venomous pit viper in southern Brazil, the name may have been chosen due to the fact the cops love it for its intimidating sound.
  - While a modernized variant doesn't exist, the modern variant is likely based on a sketch made by Shu Stella on ArtStation https://steamhost.cn
  Ace - Colt Python - american revolver, you do the most exaggerated tricks with its inspect animation ig thats cool