General term for a toy gun, including replica firearms and play guns. Often used in contexts distinguishing toys from real weapons.
See also: トイガン
子供が遊戯銃で遊んでいる。
The children are playing with toy guns.
Compound of 遊戯 (play, game) and 銃 (gun). The exact historical derivation is uncertain, but the word is transparently formed from these elements.