Absolutely. It's ridiculous to say a system isn't right when you're running steel cased ammo. If a combination is more reliable with an underweight buffer, it's not the correct buffer system's fault. Keep in mind that the A5 is effectively a rifle buffer system with the bias spring being debatable... negligible in my opinion, but whatever. Any quality AR with good ammo should run the Rifle buffer system perfectly. If not, DON'T blame the buffer system.