The
gas cylinder lock threads on the barrel and holds the
gas
cylinder firm against a shoulder on the barrel. In between the cylinder and barrel shoulder is the
band, which orients the barrel to the
stock ferrule. This orientation being a constant, means accuracy is on the road to being constant. Similar to forend pressure on a bolt action.
The threaded
gas cylinder lock, should tighten up the
cylinder against that
band, against the barrel shoulder, to hold the orientation of barrel to stock constant.
Basically if your front band is flopping around(like many are from SA) or the lock has to be excessively tightened....a shim can rectify it all.
From the front, the gas lock should snug up around 4-5 oclock, and hold everything in place. Sometimes they don't. Shim.
Unitizing is another answer, but you might want to have your final stock and some bedding in place to delve into that.
The forum link given....will have tons of detail. Heck it likely shoots great as it is.
