For god's sake. I spend ages looking for my shorter G5 rails, find them and then realise I can't find the damned allen keys to fit them with! Why does everything I need just vanish!?
The other thing about the HiCapa ones is they don't have a standard inlet valve. Its deeper than the stock mags and actually holds on the baseplate. I had to replace one of them and tape the baseplate on. I tried for ages to find a proper replacement valve and even Mike Cripps couldn't find one.