execution by shooting; death by firing squad
Refers specifically to capital punishment carried out by shooting, typically by a firing squad. A formal, legal term.
In that country, execution by shooting is still carried out.
He was sentenced to death by firing squad for treason.
Compound of 銃 (gun) and 刑 (punishment, penalty). The exact historical origin is uncertain, but it follows the pattern of other legal terms for execution methods.