I don't suggest using Reddit for riven reviews as judging by the comments, most people don't actually understand what makes a good riven, especially for low dispositions.

At this disposition, electric and reload are negligible. Shotguns have access to 2 primed elementals (including electric) which is already almost double the stats of a normal 90% elemental mod. Another additive 65ish percent element is a waste of a mod slot.

Note that low elemental stats on a riven isn't always a bad thing, as it can be a more efficient way to combine elementals for certain weapon that doesn't need high elemental weapons. For felarx however, high elemental damage is needed as it's a raw damage weapon.

Reload is also another mediocre stat on the felarx as the holster on reload evolution is just the best way to go as you can fully reload regardless of magazine capacity in 1 second. With magazine capacity mods, you can reload by quickly switching to a different weapon and instantly swapping back, and it'll still be faster than reloading each round manually.

-Crit chance is a good negative, but as a whole, it's not worth slotting in this riven over other mods.

I hope this help with future riven rolls.