Games like Gun Shop Manager
Games like Gun Shop Manager include Stardew Valley, Potion Craft: Alchemist Simulator, My Time at Portia, Kenshi, and Graveyard Keeper. We matched them by the tags players give Gun Shop Manager on Steam (Gun Customization, FPS, Sandbox, Management, and Crafting): closest matches first, and among equally close ones the better-known games.

Stardew Valley
Shared: Life Sim · Sandbox · RPG

Potion Craft: Alchemist Simulator
Shared: Crafting · Management · Sandbox

My Time at Portia
Shared: Life Sim · Crafting · RPG

Kenshi
Shared: Sandbox · RPG · Open World

Graveyard Keeper
Shared: Crafting · Management · Sandbox

Rust
Shared: Crafting · Sandbox · Open World

Supermarket Simulator
Shared: Management · Trading · Life Sim

鬼谷八荒 Tale of Immortal
Shared: Management · Sandbox · RPG

Big Ambitions
Shared: Management · Sandbox · Life Sim

TOGETHER BnB
Shared: FPS · 3D · Life Sim

Internet Cafe Simulator 2
Shared: Management · Sandbox · 3D

Factorio
Shared: Sandbox · Crafting · Management

PC Building Simulator
Shared: Management · Sandbox · Simulation

Starsand Island
Shared: Life Sim · Sandbox · RPG

Kynseed
Shared: Sandbox · Crafting · Management

My Time at Sandrock
Shared: Life Sim · Crafting · Sandbox

Garry's Mod
Shared: Sandbox · FPS · Casual

Travellers Rest
Shared: Management · Life Sim · Crafting

The Scroll of Taiwu : Beyond The Dome
Shared: Sandbox · RPG · Open World

Car For Sale Simulator
Shared: Trading · FPS · Life Sim

Car Dealer Simulator
Shared: Trading · Life Sim · Simulation

Project Zomboid
Shared: Sandbox · Crafting · Open World

Automation - The Car Company Tycoon Game
Shared: Management · Sandbox · Crafting

Shoppe Keep 2
Shared: Management · FPS · Trading