3/4" Wood Dowel about 18" long, 12-14" of Skateboard tape or Sand paper (60 grit) taped to the dowel with double sided carpet tape...about 15-20 minutes of stroking it along the barrel channel will do a very satisfactory job...I just did the same to a walnut stock that had a sporter barrel channel...used a 10" section of 870 Barrel at first to get it opened up then switched to a 1" wood dowel and 50 grit...finished with 150 then 220...she now sports a Varmint barrel channel...took about 45 minutes and a little sweat...
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