Hello Jerry , I just now saw your post so ,Sorry if I am a little late ! I just happen to have an old 000 Framed 410 laying around the house here , I measured the receiver directly in front of the stock and it measures 1.598" and directly behind the frame the outside of the wood which is just proud of the metal it measures 1.614" ! This measurment was taken from a digital gauge ,Hope this helps ! Best ; Russ
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