Carl, I suspect there is no way to estimate the number of Stub Twist guns made by Parker Bros. In the "Grades" section of The Parker Story there are tables at the end of each of the grades giving a breakdown of how many of each gauge/barrel length/barrel steel were made and only the tables for Grade 1 guns list any guns with Stub Twist barrels. 10165 is a Grade 0 gun and is listed as a T0 (Twist barrels, 0-Grade) gun and I believe the only 20 ga. lifter with 26" Twist barrels in the 0-Grade tables is probably 10165.
So, if 10165 is listed as a T0 gun I suspect a lot of other Stub Twist barreled Parkers have also been lumped into the T0 category with no reference to "Stub Twist".
Just my HO.
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