Best Single-Player Games with Deep Weapon Customization

Top Tier: Deep Crafting / Modular Systems

• Elden Ring — Ashes of War swap skills/affinities on any weapon. Upgrade paths (Somber/Normal).
• Monster Hunter World / Rise — Forge trees, augment slots, kinsects, coatings, ammo types.
• Fallout 4 — Modular receivers, barrels, grips, stocks, sights, paint, legendary effects.
• Borderlands 3 — Gun parts (manufacturer, body, barrel, grip, stock, accessory, anointments) = millions of combos.
• Escape from Tarkov (Hardcore PvE/PvP) — Extreme gunsmith: every pin, spring, gas block customizable.

Action / RPG Hybrids

• Ghost of Tsushima — Sword kits (tsuba, fuchi, kashira, ito, saya) + techniques.
• Horizon Forbidden West — Weapon coils (element, damage, handling), ammo types, valor surges.
• The Witcher 3 — Runes, oils, mutagens, glyphs, upgrade slots.
• Dragon Age: Inquisition — Schematics + materials = stats/appearance.
• Cyberpunk 2077 — Iconic weapons, mod slots (scope, muzzle, software), crafting specs.

Shooters

• Doom Eternal — Mod bot choices (2 per gun), masteries, skin.
• Gears 5 — Weapon skins, execution, upgrade cards (Horde/Escape).
• Prey (2017) — Recycler → Fabricator → Neuromods + weapon mods (GLOO, Q-Beam variants).

Roguelike / Indie

• Hades — Aspects (weapon forms), Daedalus Hammers (per-run upgrades), Keepsakes.
• Dead Cells — Blueprint unlocks, affixes, scaling, mutations.
• Risk of Rain 2 — Item stacks fundamentally change weapon behavior.

Simulation / Strategy

• Kenshi — Craft weapons from raw materials, quality grades.
• Factorio / Dyson Sphere Program — Weapon manufacturing chains.

Pick based on: **Modular parts (Fallout 4, Tarkov)** vs **Upgrade trees (Elden Ring, MHW)** vs **Loot RNG (Borderlands 3, Diablo-like)**.