Mossberg 590A1 USSM

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From what I know you can. 870s are easier to put a tube extention on. If I remmember correctly the barrel on a mossberg has the locking nut attached to the barrel where as on a 870 the barrel just sleeves over the tube extention. Then you lock it into place with a nut that threads onto the mag tube. An extention can act as that nut.

Sorry if this is poorly written.

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