I found this browsing deviantart, and thought it might be usefull. Original posts here and here. Description from the original posts
Gunblade diagrams by Sam-Hall on DeviantArt
BARREL LINK FOR A SEMI-AUTOMATIC WEAPON - diagram, schematic, and
Weapons : an international encyclopedia from 5000 B.C. to 2000
Medieval Weapons v.II by 6WingDragon on DeviantArt
detailed technical drawings of weapon assembly
Fantsy Weapon Load Out by cursedironfist7 on DeviantArt
HK416 RIFLE DIAGRAM - Rifle Diagram - Magnet
weapon diagram
Weapon Diagram