Airsoft Innovations has been kicking out grenades for the airsoft industry for much of the last decade, and their latest is the Burst XL: a propane/green gas powered noisemaker. Unlike other noise making grenades such as the ubiquitous Thunder B or several pyro options, the Burst XL is very cheap to operate and incredibly safe when used property. Here is our video demonstration of the operation of this grenade:
As you can see, the Burst XL is easy to load, easy to arm, and easy to deploy. The only item to refurbish between uses is the plastic disc and gas, keeping your operating costs very low, especially when using propane with an AI adapter. The Burst XL will be arriving in stores very soon, affordably priced around $40!