Charles pierce

Totally agree with Nuts.

I have used BB Ammo 0.23g( https://mach1airsoft.com/product-category/consumables/bbs/biodegradable/ )depending upon the condition. I always liked my kids to play it safe and hence preferred ammo which were not so thick. The biodegradable property makes it even more appealing as you would not have to worry about the environment aspect. Whichever it is, the kids just love to lay their hands on the guns and start shooting. I would say go for biodegradable stuff just to be on the safer side.