Don't quote me on this, but I think the difference between Mach1, 007Airsoft G&Gs and Buy Airsoft, CAS, Shootsoft are the price. Buy Airsoft, CAS and Shootsoft seem to have lower prices and bundled with battery, etc because the upper receiver is not metal. It's some tough nylon fibre. Mach1 and 007 have metal upper receivers.
Originally Posted by johjoh
ive just received mine from buyairsoft (dont comment) i have the m16a3 version but yes with stop battery same as the one in this review 9.6v 1400mah i can cofirm high rof and my plastic lower receiver is smoked too with a black gearbox and your mag in it seriously not noticable ill put up a few pics when i got time