Then your friends a rarity or got one of the very early split gearboxes. Ics internals are one of the best around at the moment.
Agree about the grip on the Krytac its terrible but thats an easy fix. As for the TR4-18 being better personal preference but I reckon the krytac gearbox is probably the best stock box out there and the G&Gs have had loads of issues with the mosfets so for me I reckon the Krytac is better, but to be fair I am not a fan of G&Gs so maybe a bit biased.