I've been going through the same decision making process.
I wanted an 18.5" with ghost ring sights, but don't like the mossberg sights at all. The XS sights on the blackwater are great but only on the 20".
So, what I've decided is to get the 18.5" w/ bead sight and then get the ghost rings that I want and have options for rail space if I want to put a red dot on later.
Plus I'll get the +1 extension for it.
I've heard only good things about the speed feed stock and will be using it.
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