Enough Already! 15 Things About OTW Red Dot Sight We're Tired of Hearing
https://wiki-book.win/index.php?title=The_Ultimate_Glossary_of_Terms_About_OTW_Red_Dot
A gun can be a ranged weapon generally designed to pneumatically discharge projectiles[one] which might be sound (most guns) but can even be liquid (as in drinking water guns/cannons and projected h2o disruptors)