Winchester Model 21 started with 2 different size frame forgings. One for 12ga and the other for 16ga, 20ga, 28ga and 410. Then they were machined for each gauge and weither they had a solid rib or vent. Bottom line 16ga and 20ga are very close in size.
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" May you build a ladder to the stars climb on every rung and may you stay forever young "
Bob Dylan
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