Forge / NeoForge

Requires Cloth Config API.

Fabric

Requires Fabric API and Cloth Config API.

Mechanics

RMB loads and fires guns. Full sized ones can't be used from offhand.

All guns are unusable inside water and bullets lose power when flying through it.

Bullets can ignite TNT and destroy some blocks (only non-stained glass panes by default).

Headshots increase bullet damage by 30% (applies to most bipedal mobs).

Musket

Musket recipe

Damage: 16
Durability: 250
Enchantments: Knockback

Musket Upgrade smithing template

Musket Upgrade

Required to craft upgraded muskets. Has a high chance to spawn in strongholds and woodland mansions and with a lower chance in other overworld structures.

Musket with Bayonet

Musket with Bayonet smithing recipe

Melee damage: 5
Enchantments: Sharpness, Smite, Bane of Arthropods

Scoped Musket

Scoped Musket smithing recipe

Zoom factor: 3x
Durability: 150
Enchantments: Knockback

Greatly improved accuracy and reduced bullet drop. Use RMB to aim and LMB to fire.

Blunderbuss

Blunderbuss recipe

Damage: 21
Durability: 200
Enchantments: Flame

Fires 9 pellets with much higher spread than musket.

Flintlock pistol

Pistol recipe

Damage: 12
Durability: 200
Enchantments: Quick Charge

Can be fired from any and both hands. You can reload both by holding down RMB.

Paper cartridge (ammunition)

Paper cartridge recipe

Dispensers can fire them dealing 10 damage.

Monsters

Pillagers and skeletons (all kinds) can use guns. They also may spawn with one (20% for pillagers with a pistol, 5% for skeletons with a musket).

Monsters deal 50% damage with guns by default.

Configuration

Settings can be accessed from Forge/NeoForge mods menu or via Mod Menu on Fabric.

Bullet spread follows normal distribution like in real life but it is awkward to configure. Here is a simple table that should help with that: bulletStdDev

More information on mod source page.

ewewukek's Musket Mod