Been through the mill a bit with no.1 rig... chasing everything up the chain from reg to valve to hammer and even at the muzzle everything was as good as could be. But it was still not grouping well and throwing fliers. Stuck in a bind we threw a 10m barrel on to see if the original dommy barrel was the issue. Seems to work, this was 7-8 shots off the knee at 50m... It's going to get a hard workout because I want to be sure we've found the issue, but initial signs are looking good. Just thought it might be of interest for those pondering shorter barrels. I know some of the 400 boys are keen on shorter barrels.