There is a list of some weapons, that in my belief should be in PUBG:
Chiappa Triple Threat -triple barreled shotgun caliber 12 gauge.
SRM Arms Model 1216- is a delayed blowback semi-automatic revolving shotgun with a 16-round detachable magazine. Designed for mobility, it is light and short and intended for home defense and law enforcement.
MP5-is a 9mm submachine gun, developed in the 1960s by a team of engineers from the German small arms. The MP5 is one of the most widely used submachine guns in the world, having been adopted by 40 nations and numerous military, law enforcement, intelligence, and security organizations.
Škorpion-The Škorpion vz. 61 is a Czechoslovak 7.65 mm machine pistol developed in 1959. Although it was developed for use with security forces and special forces, the weapon was also accepted into service with the Czechoslovak Army.
SPAS-12- is a combat shotgun manufactured by Italian firearms company Franchi from 1979 to 2000. The SPAS-12 is a dual-mode shotgun, adjustable for semi-automatic or pump-action operation. The SPAS-12 was sold to military and police users worldwide on the civilian market and has been featured in many movies, TV shows, and video games.
Mosin Nagant-is a five-shot, bolt-action, internal magazine–fed, military rifle developed from 1882 to 1891, and used by the armed forces of the Russian Empire, the Soviet Union and various other nations.
Beretta ARX160-The Beretta ARX160 is an Italian modular rifle manufactured by Beretta. Developed for the Italian Armed Forces as part of the Soldato Futuro (English: "Future Soldier") program.
Armsel Striker-The Armsel Striker also known as the Sentinel Arms Co Striker-12, Protecta and Protecta Bulldog is a 12-gauge shotgun with a revolving cylinder that was designed for riot control and combat.
Chauchat-The Chauchat was the standard light machine gun or "machine rifle" of the French Army during World War I.The Chauchat was one of the first light, automatic rifle-caliber weapons designed to be carried and fired by a single operator and an assistant, without a heavy tripod or a team of gunners.
Sturmgewehr 44-is a German selective-fire rifle developed during World War II. By all accounts, the StG 44 fulfilled its role effectively, particularly on the Eastern Front, offering a greatly increased volume of fire compared to standard infantry rifles. It would go on to influence the AK-47 in the years following shortly after the war.
M60 caliber 7.62.A classical post-war American machine gun known for its service during Vietnam War.
M1 Garand- Weapon that was ahead of its time. It is s a.30 caliber semi-automatic rifle that was the standard U.S. service rifle during World War II and the Korean War and also saw limited service during the Vietnam War.
Minigun-is a 7.62.six-barrel rotary machine gun with a high rate of fire (2,000 to 6,000 rounds per minute) which can also fire at a high sustained rate.It features Gatling-style rotating barrels with an external power source, normally an electric motor
Milkor MGL- is a lightweight 40 mm six-shot revolver-type grenade launcher (variations also fire 37/38mm) developed and manufactured in South Africa.The MGL is a multiple-shot weapon, intended to significantly increase a small squad's firepower when compared to traditional single-shot grenade launchers like the M203.