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zippy13 · August 13, 2011, 01:21 AM

My friend, you have to compare the diameter of the tube's constriction with that of the barrel's bore. The second measurement, due to its being deeply recessed, is frequently beyond the capability of typical calipers.

August 13, 2011, 01:21 AM	#2
zippy13 Senior Member Join Date: August 23, 2008 Location: SoCal Posts: 6,289	My friend, you have to compare the diameter of the tube's constriction with that of the barrel's bore. The second measurement, due to its being deeply recessed, is frequently beyond the capability of typical calipers.