Airsoft bbs...?

Its perfectly okay to use them more than once. The only time that I do not reuse them is when I have been shooting at concrete. The concrete will cause some of them to crack and get pitted resulting in a malfunction when firing them. But the rest of the time its okay. Just make sure that there isnt any mud or dirt on them before reloading them into your magazine. As far as them scratching the barrel and messing up the gun, none of that is true unless you use messed up BBs. Hope this helps...