i have build a 6 vertical laminated hard wood gun. been using it for a couple of months now with no problems but on my last dive i noticed that the barrel slightly bends maybe 1-2mm. the gun is 63 inch long (butt to muzzle), 2x 5/8 bands and shoots a 1/4inch shaft.
is it something to worry about? what would be the best way to stiffen it?