An ACM grenade available for US24.99 from Hong Kong-based Airsoft Panda. You can put inside around 40-80 bbs, which can be used bbs since there's no barrel to wreck. Advised gas to use is Top Gas and this shoots out bbs in all directions. We hope you can adjust the timing of the grenade so you can get the perfect timing when releasing it. Though I would prefer a different grenade case for this.