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I bought a Browning citori 425 at an auction today. It came with several choke tubes.

They are all extended tubes, all are marked with a 740 and then they also are marked with 5, 15 or 20. They are longer invector plus style.

I'm guessing the 740 indicates the bore, but not sure about the 5,15,20 designation.

Anybody know what these are?
 

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Those designations would be the amount of constriction of the tube compared to the bore. The 5 would mean that there is .005 thousands of constriction, which would be a skeet choke. Bill Malcolm
 
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