Jam

Weapons can jam, at which point they become unusable until they are reloaded (default key: R). Jams can occur in several situations:
 * Overheating -- When weapons overheat there is a good chance that they will jam.
 * Amoeboids -- These slimy melee creatures have a chance of jamming your weapon when attacking you.

Hints

 * After unjamming a weapon with the reload key, the weapon will still be hot.
 * If you do not repair your weapons at a vendor when they are damaged or after a death they will jam frequently.