Originally Posted by
Gater
Running a 14 inch barreled shotty was revelatory for me--it really is a sweet spot. I have an 18.5 inch 590A1 (currently with a Vang +1) that I have seriously considered going the SBS route on, but the NFA process is new to me.
OP, your comment on the six round 590 tubes piqued my curiosity, since my recollection was that when Mossberg originally went to 6+1 18.5 inch 590A1s in 2016 (along with a railed forend), they used a flush mag extension (by Choate, I think). After poking around, it appears they are indeed using a 6 round tube now. Unfortunately, I think that will mean that the older barrels like mine aren't compatible with the new mag tubes. On the plus side, if you have a new production gun (or upgrade to the new tube and barrel), I think the six round tube with a flush fit +1 will get you to 7+1 with an 18.5 barrel.