The black gearboxes are rather impressive, My Echo1 Stag-15 came with one and it feels a lot more bulky and stronger then the older ones. But as for the two companies Echo1 has more quality control then JG otherwise they are the same just about except Echo1 has trade marks. I prefer Echo1 though because i got a JG and it fell apart and I had to fix it but I think i had a lemon because ive seen other pretty good ones.