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Not to horn in but the beveled cut you see was a std item on those bbls, not porting. Function? I think it may have been for a set of bbl wgts.
Those cuts are for the muzzle brake or stabilizer. There is a small Allen screw that screws into those cuts from the brake to hold it on... the threaded holes in the bottom of the barrel are for weights.
 

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look at the mod 102 with a 6.75 in barrel. It is ported, back in the mid 50's.
I thought the last factory ported barrels were on the 101 series and starting with the 102 "space gun" barrels, the muzzle brake or stabilizer took it's place, but I could be mistaken.
 
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