In this guide, I want to write my speculations on what weapons were based on from strinova. I may be wrong somewhere, and if so, I will be very happy if you correct me in the comments. This guide was created just for the sake of interesting information, some weapons can even describe the character itself.

The Fuchsia's “Sawtooth” weapon was obviously made in the likeness of the FN Scar-H. (short version) The FN SCAR is a weapon system developed by the American division of the Belgian company FN Herstal to compete for a new assault rifle for USSOCOM fighters in 2004. This rifle is very large in size and weight compared to its neighbors like the M4 or AR15. This most likely shows the rather formidable nature of the fuchsia itself.
The Famas F1 rifle can be easily identified by the shape of Celestia's "Polaris" weapon. This is a bullpup assault rifle made by MAS. This rifle was adopted by the French Army and fires three rounds each. Just like in reality Celestia can put a modification on the weapon to shoot 3-round each time you hit the trigger. It's also worth mentioning that unfortunately they (French Army) eventually gave up and replaced it with the more suitable HK416F.
I think even the most remote from guns will be able to recognize Yvette's “Beareas” as the lightweight and practical HK MP5 A2. A family of submachine guns developed by German small arms manufacturer Heckler & Koch (HK) in the 1960s, based on the HK G3. This weapon is small in size like the Yvette herself, you can notice that the handguard is slightly modified and has a built-in flashlight.
Bai Mo's “Freedom Reign” are distinctly reminiscent of the Benelli M4 Super. The Benelli M4 Super is a smoothbore semi-automatic magazine-fed shotgun developed in Italy by "Benelli Armi S.p.A." It is quite a high-speed shotgun, which is massively used in many countries. There are also modifications of this weapon in the form of under-barrel shotgun. The Bai Mo version of the weapon features a slightly modified pistol grip and a “Red Dot” collimator sight made by Aimpoint.

Flavia's weapon still vividly displays the shape of the Kriss Vector 45.acp. This weapon is incredibly fast firing, as well as almost no recoil both in reality and in the game. The main task of the designers of this weapon was to achieve the highest possible accuracy of firing in bursts using .45 ACP cartridges with high stopping power, but at the same time to minimize the size and overall weight of the submachine gun.
Maddelina's weapon has a fairly similar shape to the HK G28, although at first I thought it was an MK14. The HK G28 rifle was developed by Heckler & Koch specifically for the Bundeswehr as a support weapon for small infantry units. The G28 is based on the HK MR308, which, in turn, is a civilian version of the HK 417 automatic rifle. Despite several differences, the HK G28 is 75% interchangeable with the HK 417. This rifle is designed to shoot at distances inaccessible to standard 5.56mm assault rifles.
Michele's weapon is based on the M4A1,The M4A1 Carbine is a shortened version of M16. It sports a shortened barrel and collapsible stock, making it the Special Operations weapon of choice. In contrast to the M16A2, with its 3-round burst mode, the M4A1 is capable of fully automatic fire.
Thanks to the SOPMOD program, the M4A1 can be modified with a variety of special accessories, including optics such as the M68 Aimpoint and ACOG, an easily detachable suppressor, an M203 underbarrel grenade launcher, and many others.

The Kokona's weapon has the obvious signs and shapes of the Cheytac M200 Intervention, an excellent rifle that is often used in military conflicts. CheyTac M200 “Intervention” is a sniper rifle. It is part of the CheyTac LRRS sniper rifle system. Manufactured by CheyTac LLC (in USA). It uses special Wildcat sniper cartridges: .408 CheyTac and .375 CheyTac.
Yugiri's weapon is one of the Steyr AUG versions (A1, A2, A3) but still I think it is a modification of the Steyr AUG A3 rifle. The STEYR AUG A3 modular weapon system is a result of the continued development of the world renowned STEYR AUG rifle series. The STEYR AUG A3 design is also based on modular system components, which can be configured from one variant to another quickly and easily, without tools, and at unit level, in order to meet a wide range of future weapon requirements.
Ming weapon has a familiar shape of rifle from AK series (Avtomat Kalashnikova) This series of weapons has many different models and variations, but my choice falls on AK-12. The AK-12 is a Russian assault rifle and is the newest derivative of AK pattern-rifles produced by the Kalashnikov Concern. It has been proposed to the military to be the new service rifle of the Russian military, along with potentially replacing other older AK-pattern designs in use with various military forces around the world.
The Lawine weapon is a nearly unmodified version of the not particularly popular XM-8 weapon (which is often confused with the G36) The XM8 is an experimental assault rifle manufactured by Heckler & Koch for the U.S Army. It was slated to replace the M16 family of weapons, but these plans have now been abandoned.
The Meredith weapon as well as the Yugiri weapon is based on the AUG Steyr series of weapons, but this time it is the A2 model. The Steyr AUG A2 is a bullpup assault rifle of Austrian origin. The rifle is made of high grade plastics and is in service with the armed forces of Austria, Australia, Ireland, and numerous others. Note that some Steyr AUGs used in movies are possibly Australian made F88 rifles or civilian market AUGs.
The Reiichi weapon is another Russian rifle, specifically the SVD Dragunov (modern version). The SVD (Snayperskaya Vintovka Dragunova), also known as the Dragunov or SVD Dragunov, is a sniper rifle produced in Russia by Izhevsk Mechanical Works. It is chambered in 7.62×54mm and has been used by the Russian army since 1963. The Dragunov had been reported to be a very fine firearm by its operators, and it still continues to be in service around all of the former countries of Eastern Bloc.
Eika's weapon is a heavily modified model of the AA-12 automatic shotgun. (probably the ugliest shotgun in the world) The AA-12 (Auto-Assault 12-gauge, originally Atchisson Assault) is an American automatic shotgun that is produced by Military Police Systems. Originally developed by Maxwell Atchisson during his tenure at the Military Armaments Corporation in the early 1970s, the production rights were eventually sold to Jerry Baber of Military Police Systems in 1987.
The fragrans gun is very similar to Michele's, but still I think it's more like the HK 416. The HK416 is an AR-15-variant assault rifle, manufactured by Heckler & Koch. It features a proprietary short stroke gas piston system derived from the G36 family of assault rifles. It is currently in use by some United States Special Operations Units as a replacement for the M4, and the Norwegian Armed Forces as a replacement for the AG3. It is also used by some European special operations forces, like the Polish GROM and the German KSK.
Audrey's weapon could be either the MG3 or MG42, most likely an amalgamation of both models together and further modernization, but the main variant is most likely the MG-42. The MG 42 (MaschinenGewehr 42, lit. "machine gun 1942") was a general purpose machine gun that was developed for and entered service with the German Wehrmacht in 1942 during World War II. The 7.92mm rifle caliber weapon was developed from, and was intended to supplant the MG 34, though both would continue to be used and manufactured until the end of that war.

The following weapons may not be entirely correct, as I have not been able to find out the exact model of these weapons. If someone is sure that he knows the model of the weapons below I will be glad to hear your opinion in the comments.

Kanami's weapon is most likely a modified version of the Barrett M82 sniper rifle. The Barrett M82, informally known as the Light Fifty or the Barrett .50 cal, is a high-powered special applications scoped rifle developed by the American Barrett Firearms Company. It is chambered in the .50 BMG cartridge. This was the first gun to put the .50 BMG cartridge in a shoulder-fired rifle that could be operated by a single individual.
Nobunaga's weapon reminds me of several weapons at once, though it still has more of the outline of a sniper version of the HK G3 rifle. The G3 is a West German battle rifle designed by Heckler & Koch during the 1950s. One of the most well-known battle rifles in existence, the G3 is very widely used by many countries around the world. Its design can be traced back to the old prototypes as manufactured by CEAM in France, such as the CEAM Modèle 1950, which evolved into the CETME rifle, which is what the G3's design was based on. The G3 was the standard rifle of the Bundeswehr between the late 1950s and late 1990s, and has since been replaced by the G36.
Galatea has probably the most confusing weapon in the game in terms of looks. Many people think that this weapon is from the AK series, but I believe that it is the Galil IMI, or rather a more modern version, I was even able to find a similar model on the photo, but unfortunately with a short barrel. Also this weapon could also be the A545, as it has very similar parts to this weapon. Also for sure it could be a composite concept from the AEK-191, A-545 and Galil IMI.
The leona's gun is really the weapon that confuses me, but if believe the information the good people in the comments have provided, it's the Ultimax 100. The Ultimax 100 is a Singapore-made 5.56mm light machine gun, developed by the Chartered Industries of Singapore (CIS, now ST Kinetics) by a team of engineers under the guidance of American firearms designer L. James Sullivan. The weapon is extremely accurate due to its constant-recoil operating system and is one of the lightest machine guns in the world.

The Stinger is a secondary weapon in the game that has the flashy and distinctive UZI molds. The Uzi (officially cased as UZI) is a blowback-operated, magazine-fed, shoulder-fired, select-fire Israeli submachine gun.

Athena is the IMI Desert Eagle, probably the only weapon in the game that has undergone minimal changes. The Desert Eagle (nicknamed "Deagle", a portmanteau of the two words in its name) is a large-caliber semi-automatic pistol designed by Magnum Research in the United States. The Desert Eagle is chambered in many calibers, including .357 Magnum, .44 Magnum and .50 Action Express.

Emberspit is a handheld flamethrower that has no real analog, but is just a figment of the developers' imagination. However, there are similar tools in real life.

Ignis as well as Emberspit do not exist in reality, but there are many similar short-barrel shotguns in reality as well

The Ninjato is most likely just a shortened version of the katana, and also has a more modified blade rather than the usual steel blade.

I want to express my respect to the developers of Strinova, that they did not create new weapons, but took as a weapons from real life. Most of them have not even undergone strong changes, and in 90% of weapons you can easily see the real analog. I made this guide just for fun and if you know what can be added or changed, please let me know in the comments.