The theft, in Cardonald, saw kit used in the sport of Airsoft - a sport similar to paintball - lifted from a parked car.
Police Scotland said items taken included replica rifles and replica Glock pistols.
Items including face masks, combat vests and the blank-firing grenade - which was in a large red, white and blue Diadora gun bag- were also stolen.
The car was broken into in Allanton Drive, Cardonald between Monday August 19 and Tuesday August 20.
Anyone with information should contact Govan CID on 0141 532 5400, 101 or contact Crimestoppers anonymously on 0800 555 111.