Tech Weapons
Tech weapons are guns built for precision and for their ability to pierce solid cover. Many of them can be charged before firing. A charged shot is far stronger than a normal one, and it can punch through light cover to hit an enemy hiding behind it.
Charged Shots
Holding the trigger builds up a charge, and releasing it fires the charged round. The game's own tutorial puts it plainly: Tech weapons allow V to charge up powerful shots that can pierce light cover to hit enemies. Tech weapons take their own ammo, such as flechettes, pellets and slugs, which the game labels as ammo for Tech weapons.
Mods and Builds
Tech weapons take Tech weapon mods. They suit builds that invest in Technical Ability, whose perks speed up the charge and help Tech shots ignore armour.
All Tech Weapons
Every tech weapon with a page is listed below by class.