BB weights do not cause damage to guns in any way.
The only problem with too heavy bb's in stock guns is that the hop up might not be able to lift it properly.
Heavier bb's fly slower but steadier and push through grass/leaves better than light ones.
I use 0.30 in all my guns.
Even heavier for sniperrifles. ~0.40+
//BG
0.28 BBs in Tokyo Marui SCAR-H, P90, and FN5-7
Re: 0.28 BBs in Tokyo Marui SCAR-H, P90, and FN5-7
Alright, good to hear! Been using 0.20 BBs and they aren't cutting it. Think I might go to 0.28 then.