I have an Umarex G36CV and it's actually pretty consistent out of the box. The groupings are very small and the tolerance of the gear box (version 3) is already pretty tight. It comes with an unported cylinder and by my rough calculations it could probably support up to about 400 - 500 mm length of barrel (Just over 22,000 mm^3 of air volume from the cylinder).
I'm planning to put a 400 mm 6.03 barrel into mine with a Guarder cylinder upgrade kit, but I haven't tested it out yet.
|