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If I have a Model 870 barrel that is marked for 3-inch shells, can I use this barrel in my Model 870?

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Overview

The barrel and receiver design determines what can be shot from the Model 870. All barrels are clearly marked with chamber information located about half way down on the left-hand side, "side opposite ejection port". Receivers are marked with letters at the end of the serial number that determine ejection size. 

 

 
Serial Number Suffix Gauge Ejection
V 12 2 3/4" Only
M 12 2 3/4" or 3" Only
A 12 2 3/4", 3", or 3 1/2"
W 16 2 3/4" Only
K, X 20 2 3/4" Only
U,N 20 2 3/4" or 3" Only
J 28 2 3/4" Only
H .410 2 1/2" or 3"

 

Other helpful articles:

Which barrels are interchangeable on the Models 870, 1100, and 11-87?

Can you put a Model 870 magnum barrel on an 870 Super Magnum firearm?

How can I tell if my Model 870 shotgun has a magnum receiver?

What barrels are available for my Model 870 Special Field shotgun?

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