The only sidearm with some real world resemblance, the "LS45" appears to heavily based on the Beretta 93R Auto 9, featuring the same style of open top longslide. It has a two-tone finish, with brown grips. Unlike the Auto 9, it is chambered in .45ACP and functions as the game's more powerful sidearm, with a 7+1 capacity.
Submachine Guns
"AP-25"
A compact carbine heavily based on the TDI Vector, chambered in 5.56mm. The actual Kriss Super V and pistol-like magwell is replaced with stubby 25-round magazines. It also mounts a reflex sight.
"Gruber 5"
Two submachine guns appear in-game under a "Gruber" moniker - both being based on real world Heckler & Koch MP5 variants. The "Gruber 5" is a heavily stylized Heckler & Koch MP5K, without the vertical foregrip.
"Gruber-SD6"
The second "Gruber" variant matches the Heckler & Koch MP5SD6, as its "Gruber-SD6" name states. It has a Romanian/East German coat hanger AK stock.
"NACK-11"
One of the Defenders criminal specials, the "NACK-11" is an Ingram MAC-11 in a futuristic boxy shell.
Shotguns
"Super Shotty"
Two Ithaca 37 style shotguns (albeit as open-top ejection port) appear as shotguns for the Defender faction in Due Process. The "Super Shotty" is a cutdown Miami Vice style Stakeout, though with a standard wood forend. It is used in the Sidearm slot.
"TUB-12"
A longer Ithaca 37 Stakeout style shotgun is available as the "TUB-12."
Rifles
"BLK-TAR"
The standard Attacker/Cyberpunk SWAT rifle, the "BLK-TAR" closely resembles the IMI Tavor TAR-21 as its name implies - specifically the early non-flattop versions. It is semi-automatic only, and chambered in .300 Blackout, using 20-rounder magazines. A Vortex UH-1 style sight is also mounted.
"F1-Legros"
Possibly the game's most eclectic and unique weapon, the "F1-Legros" rifle is a mishmash of several wood and steel rifles. Its heart comes from the 1890s-era Blake Rifle (a competitor in US trials to the Krag-Jørgensen), a bolt-action design that used detachable rotary revolver "packets" of ammunition. The Legros is also chambered for the real world .30 Blake cartridge that was developed for this system. This Blake system is mated to a semi-automatic action that has elements resembling the Farquhar-Hill Rifle and MAS-49/56.
"IngMar 57"
The "IngMar 57" rifle closely resembles the SIG SG 510 or Stgw 57, as the name implies. It has a green SVD style stock. The IngMar features a scope, and loads from 20 round magazines, and fires in full-auto with high recoil.