For a long action in a Prairie Hunter, the stock fore-end extends 8 3/4" from the front (muzzle end) of the small shank barrel nut. At that point my barrel diameter is 18.7mm. The diameter at the front of the barrel nut is 25.9mm. The barrel free floats all the way back to that end of the barrel nut. There appears to be at least 3/32" of clearance on each side of the barrel that could be taken off the stock rails without incident if necessary. Hope this helps. Let me know if you need pics.
KeS
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