The front sight will not work on the Retrograde unless you have a gunsmith solder on a front sight ramp.
Monte @ XS
The XS Sight Systems Shotrail, Ghost Ring & Standard Dot White Sights for the Mossberg 590 will be compatible with 12- and 20-gauge model 590's.
The rail and rear sight will fit just fine. You will need to have a gunsmith solder on a ramp for the front sight.
Monte @ XS
The XS Sight Systems Shotrail, Ghost Ring & Standard Dot White Sights are not listed as being compatible with the Shockwave. I would recommend reaching out to the manufacturer for more information.
https://xssights.com/contact-us/
Yes. The correct XS Sight Systems Shotrail, Ghost Ring & Standard Dot White Sights for the JM930 is MPN:MB-4000R-1. It will be a straight drop in installation if you have holes drilled and tapped into your receiver.
Yes. The XS Sight Systems Shotrail, Ghost Ring & Standard Dot White Sights will fit all versions of the 500, 590, and 930.
installation if the receiver has been drilled and tapped at the factory should be pretty straightforward. However before ordering I would suggest measuring the barrel out where the bead front sight is to see what the diameter is. Mossberg has built he 590-590a1’s with both their std weight barrel and a Heavy Contour barrel. If the latter then the banded front unit will not work. The Std barrel will be in the 0.840-0.860” size range and the Heavy Contour barrel will be 0.920-0.940” in size.
XS Sights has an install video on their site.
https://www.xssights.com/Detail.aspx?PROD=993356
Yes, this kit should fit the 835.