Thanks David, that rifled tube is great! I see that the brass cap helps to align (center) the tube as well as actually tightening it into the barrel.
I can't quite make out the checkering pattern on the forend - can't tell if it is the 2-point (grade 0 & 1) or 3-point (grade 2) pattern.
The checkering pattern shown is the 3-point pattern of the grade 2 guns. The 2-point pattern on the grade 0 & 1 only has the two large checkered diamonds and lacks the much smaller diamond in the center.
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