In my post of the build of this beast,
it was obvious that there was a noticeable "droop" in the gun barrel.......
This was a problem in the master.....
so..... I cut the mantlet from the barrel.....
drilled it out (about 1/8 " deep).....
cut 1/8" from the rear end of the barrel....
and glued them back together.
while this "shortened" the gun,
it still allowed it to keep a "respectable" length.
the best thing is that it cured the droop.