This one is very good, even though it's not really a mortar. No messy chemicals, fireworks, or ballons. Reloadable mid battle! costs about $1 for every one you make.https://www.instructables.com/id/How-to-make-a-cheap-airsoft-Madbull-grenade/
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thanks that helped A LOT
In order to answer this, we kinda need to know what you intend to shoot out of it. Nerf footballs? Tennis balls? Smoke Bombs? Kittens?
i said airsoft so airsoft bbs
I don't think this is would be a very good idea. After you shoot the bb's up in the air, they will probably be coming down so slowly that they would not make for a very effective airsoft weapon. These are the plastic bb's right? I don't they are heavy enough to rely on gravity for their speed. I could be wrong though. Here is a video of someone who made one: http://www.youtube.com/watch?v=EGC3Jc40-T8It looks like you could get away with making it like a spud gun except you point it in the air instead of straight out.