The harder to get mods are the two Primed mods (Baro), [Shell Shock] (also Baro), and [Blaze] (nightmare missions).

For beginners, the Primed mods can be replaced with their normal versions, you can replace [Shell Shock] with [Charged Shell] (and add [Contagious Spread] maybe), and [Blaze] can be replaced with [Scattering Inferno].

This is a very impressive shotgun that you can assemble from Invasion missions, and is a great status weapon for late game. I use it for sorties etc.

Keep in mind that 'Status' is displayed as 'per projectile' now, so the other older builds listed at 100% etc are still shown in the old way. This build with 37.2 Status/projectile is definitely over 100% status per shot.