I have shot a shift kit on a Clone VX. The idea behind threading the barrel insert into the barrel back is genius. It does not lend to wearing out like the aluminum freak inserts which had a tendency to wear out and "float" in the barrel back over time. Shot consistent groups with the Shift Kit over a day of play.
FYI, 95% of the paints listed in the link below are not sold anymore.
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December 22, 2012
from Staten island, NY United States
DONT listen to the guy below
I dony own a macdev marker but 679 is not the smallest bore ill give a link to exact boresizes of diffrent kinds of paint