When you pull the Brno barrel you will have the thread info in front of you. The Anschutz Match 54 barrel has oodles of meat for threading, and it will need extensive turning to get the weight down for a sporting rifle. Shorten it at both ends to get the best part of the barrel (20 inches is any Gods amount long enough for .22 LR). There is probably enough meat at the breech to keep the chamber if you want, but I would shorten and rechamber it anyway. Like the original Brno barrels, the Anschutz bore is slightly tapered to the muzzle.
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