Maybe it's just me, but I really dont think that I need to try any different ammos if my gun ftf, fte and fail to fire. If SHTF and you only have one type of ammo that you can find.... what are you going to do? praying that you get the right type of ammo that your gun can run flawless? I am very upset at people comments on gun forums that you need to try different type of ammos. I have GSG-5 copy MP5 that I got sometime last year. It shoot great until couple months ago it start to ftf, fte, ftf.... I check out other website for troubleshoot and saw people comments try different ammo... I dont pay $500 for a riffle that picky on ammo. Even the ATI website state that use different ammo for troubleshooting. WTH? Why dont they fix the gun that can take all the ammo?