The 4 would be the unstruck (before final filing and polishing) barrel weight for 4 lbs even. Is there was a superscript number with it that would indicate the number of additional ounces. The 3 is a new one for me being that far towards the breech.
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May you be blessed with plentiful game in the fields, the time to hunt, a good bird dog in front of you, a Parker in your hands and friends to share the adventures with.
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