Spira Silent killer 22k burst

While certainly not a Lex Prime, the Spira is still a formidable weapon in its own right. As it is silent and has a decent crit chance, this looks to be the sidearm of choice for stealth runs or characters with invisibility (namely, Loki and Ash). While you could elect to not use primed mods, you will loose out on a fair amount of DPS that way.