Ye the blueprint will reveal from killing the commander, sounds like unfortunate rng, just keep at it you’ll get it, ye you could kill the commander if you don’t get it quit out and start again, but ye from what i can remember farming the pennant it will show bottom left if you get it good luck.
Primary, ignis wraith straight forward as to why, Trumna, honestly is so under appreciated great fire rate, great mag, decent damage on primary, get 5 kills send out a bouncing ball of hell, works great on gauss, volt and titania with its consistently good output of rounds, and big mag and gauss can buff it
secondary, kuva nukor like zakkhar said, occucor, sonicor, atomos, tenet diplos,, catchmoon i say catchmoon for its ability to just one shot everything with gauss buffing fire rate and combined with pax charge no running out of ammo it’s solid i know you mentioned fire rate etc
melee, bo prime, dual ichor, innodem, i know you didn’t mention melee, but if you do want any ideas these guys are solid.
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