Thanks for the info. I've decided I will not bother with removing the tube to change the barrels. For my usage the Maverick 88 will do fine and the 590A1 flex will be mostly a spare and range use for now.
So I've received the Maverick 88 security/field combo (two barrel combo). It's Mossberg product id #31014. https://www.mossberg.com/product/maverick-88-security-field-combo-31014/
I'm happy with the purchase so far. It's much lighter than the 590A1 so will be easier to carry when camping and...
That would be ok as long as the chamber end of the barrels mates with the receiver.
But I will order the Maverick 88 regardless as the M590A1 is heavy to carry when hiking and I like having a second spare shotgun anyway.
Anybody know whether the barrels are interchangeable?
I have the Flex M590A1 marinecote with 18.5" barrel and plan on getting the Maverick 88 combo 18.5"/28" barrels.
I'd like to use both the 18.5" and 28" barrels from the Maverick 88 on the 590 sometimes.