Get the 590 if you can afford it, but you can't go wrong with the Mav if it fit's your budget better. The 590 has the tang safety and is drilled and tapped for optics, and you can upgrade the forend, so the differences might not matter depending what you're going to use it for.
Here's another option to consider, much cheaper, does not require a permanent modification to your gun, and corrects high shooting that is inherent in the short factory bead:
https://defendertactical.com/products/highball
Not true. The seller of the third item had a 590S arrestor fall out during comparison shooting, that was the whole reason to look at the attachment mechanisms and do the comparison video you didn't like. You've made it clear you don't believe in doing comparisons that show a competitor in a...
You should consider the Universal Minishell Adapter from Defender Tactical.
https://defendertactical.com/products/1-3-4-to-3-shell-adapter-for-mossberg%C2%A9-500-series
Possibly, but I think it would take quite a bit to twist that mag tube. Might need to go ahead and heat it up as well to reduce the breaking torque. People are buying new guns and removing the mag tube with vice grips to sell as replacement parts, I just don't want to mar up the gun so I...
OK we have an idea that's easy, probably too easy to actually work, but I'll throw it out there....
We have a tool we developed for removing the spring retainer dents from the mouth of Mag tubes (needed when adding our Mag Extension, etc). Anyway it is a 2-part tool, a swage you drive into the...
10-4 to that. No reason for loctite the mag tube is captured once the barrel and screw is installed, it can't back out. Anyway we'll keep you informed if we come up with something. I see people who are buying new 88's and selling the parts on eBay, all the mag tubes I see have vice grip marks...