A quick look at the new Airsoft Innovations Bang 22 Xtreme Timer Sound Grenade... "Airsoft Innovations is proud to launch the Bang 22 Xtreme Timer Sound Grenade. This Xtreme device uses super common powder nail driving cartridges (NOT BLANKS) to give some of the LOUDEST bangs in airsoft! It uses our simple and reliable 3-position selectable timer, full metal construction, it's super easy to use, and doesn't require any maintenance!

Cartridges are easily available at any Home Depot, Lowe's, Ace Hardware, and Amazon."