I believe that you don't want a 6.01 then, I was told that 6.03 is probably what you'll want because of some reason or another (anyone back me up on this?), the only time you should use a 6.01 is a BA or semi rifle.
BB Bastard also makes a Bio BB now so check them out as well as the Bioval BBB. Who knows maybe you can even become a regional Bastard.
Also depending on the brand of gun you get it might be a wise idea to purchase a correctly ported cylinder as some companies just use a non ported cylinder on all their lineup.
Finally, 400 FPS they mean on .20g BB's. Really they should say 1.41 Joules MAX but 400 FPS (using .20g BB's) is much more easily understood by the general public.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE