I tend to read factory barrel as meaning sportster.
On the Boyd's sight, they should have a couple barrel channel measurements listed for reference with each stock.
From 12 tbr blind centerfeed Bull barrel.
Barrel Dimensions: Point A = 1 5/16" and Point B = 1 1/16"
From 12 tbr blind centerfeed Factory barrel.
Barrel Dimensions: Point A = 1 5/16" and Point B = 3/4"
I would read Point B as being the barrel channel at the forearm.
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