This pack adds five items into minecraft:
M16 - rightclicks to fire
M4 - leftclicks to fire
Steyr SGG - leftclicks to fire
USP - leftclicks to fire
Bandage - rightclick to use

All items are crafted with floor crafting:
M16:
1x iron block
1x lever
M4:
1x iron block
1x leather
Steyr SGG:
1x gold block
1x lever
USP:
3x iron ingot
1x lever
Bandage:
1x paper
1x string

all crafting info can be obtained but typing
/function guns:crafting_recipes

or the appropriate function command for each gun
Ex: /function guns:m16

there are also very simple but good looking blood particles that play when a mob is hit with a bullet

this datapack will have a partner datapack called Zombies+ for a full apocalypse challenge uploaded soon
with both maybe having a trailer

also please report any issues in comments

there isn't must to showcase with the images so a video might be released later on