[Sim123456]

Hi guys, my WE SCAR, when on full auto, break my bbs if I do more then small burst. The gun works perfectly on semi and the full auto with emptied mag works also, but if I fire on full auto more then 2-3 bbs, one bb will break in half and cause a jam: then I have to remove the magazine, remove the half broken bb in the magazine and in the gun (by cocking the lever). I m using Madbull high precision .30g bbs. Any ideas what is causing this, thank you