Remington 870 extention tube in the winchester model 1200 SHOTGUN

The threads are different and you can't use a Remington tube in a Winchester.

Choate lists extensions for the 870 and for the Winchester. They are not the same.
 
The extensions are the same for the 1200/1300/SXP/and Stevens 320.
Why not just buy one for the Winchester?
The 870 threads are different.
 
Magazine extensions for the 1200,1300, SXP etc are also the same for all gauges of these models. The magazine tubes are identical in size and in smaller gauges the receiver feed throat tapers to center the shotshells.
 
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