Here are some guns i recommend:

Assassin's guise (has the basic SMG and sniper rifle) - around 100k normally

Nano-c - around 1,000,000 gold (this item is a luxury item most people dont have and it is a assault rifle)

Space Wars Tech - around 60k normally

GAU-3 Sasha (mini gun) - around 70k

Astral Commando sidearm (a huge a** pistol) - around 146k normally

Silver Revolver (a pistol) - around 60k normally

Diplomat Magnum (another huge pistol) - 286k normally

The Case of Pietro 4th Gen. (a small sidearm) - around 2,000,000gold

SOF Taiga (Gatling Gun) - around 300k normally

Black SPS-12 Pump Action Soaker (only if you dont have much gold) - around 4k

Pistolera (a nice pistol) - around 220k

MSXXX-01W Gunguy (a rifle) - around 120k most of the time

Human's Bazooka (a bazooka) - around 20k normally

Lyndexer's Companion (a rifle) - around 300k+ normally

Hunter's Companion (a rifle) - around 300k normally

Defender Pump-action (a shotgun) - around 40k average

*IF I MISSED ANY GUN ITEMS POST THE NAME BELOW SO I CAN ADD IT TO THE LIST*