(0.12g bbs & used bbs) + (40mm M203 shells & AI Tornado Grenade) = ?
 

1a. Would you use 0.12g bbs in a 40mm M203 shell?
1b. Would you reuse used bbs in a 40mm M203 shell?

2a. Would you use 0.12g bbs in a AI Tornado Grenade?
2b. Would you reuse used bbs in a AI Tornado Grenade?

If you have any experience on said questions, please elaborate on your results and/or recommendations.

Heavier BB's work better in Tornado grenades. If you use too light a BB, people can't feel/hear them as well.
And yes, since grenades don't have precision barrels like AEG's, reusing is fine.

I have a bag of BBs that I have labeled "shotgun and grenade". It's pretty much a mix of literally any BB I can get my hands on. There's 0.12 walmart specials, 0.2s, 0.25s and 0.28s in there. A mix gives you a good spread when the grenade goes off. Plus, it's cheaper ;)

Personally I just use all my crap bb's in my claymore mines. I like to take care of my 40mm and Tornados

I never liked the AI grenades but i do use all the used ammo for our Grenades and directional mortors.

Agreed , the AI grenades are great for indoor but outdoor ( not just woodland stuff but all outdoor) then seem to not be effective unless you have a per foot rule.

But I do use crap bb's and used bb's with a mix of .12 - .28 for my 40mm nades

Even for indoors i find they take way too much fiddling and constantly need maintanence had 3 or 4 of em on the team and everyone crapped out withing 3-10 throws. and to spend 100$ a pop only to turn around spend more on parts and kits to fix em Fuck it ill go with my own. Way cheaper and no one gets hurt if you accidently hit someone with it.

You can reuse the bbs for tornado and the 40mm but DO NOT USE shitty bbs the imperfection will cut your oring on your 40mm I particularly like the bass pro white .18 and I like to mix it up a bit with teh bastard .20/.25/.28 but only after a wash down to get rid of the dirt /dust that accumulates.

Funny cause no matter what bb's I have used they tear up the o ring that holds the bb's in place. Right now I just wrap some teflon tape around where the oring would go to keep them in place. Its fast easy and cheap

I've yet to replace the retaining oring on my kings.

but I typically will use the crappiest of crappy bb's in my xmpb4's.