help me make Lex viable please

I really like Lex and Lex Prime, and I want to make them viable, at least usable on high level content. Recommend me mods, elements and builds I can use, please. I already put 4 formas on my Lex and 1 on my Lex Prime, but I don't know which mods to use. Should I use puncture, since the guns base stat is high?

submitted by /u/SuugoiDesuu
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source https://www.reddit.com/r/Warframe/comments/yhprow/help_me_make_lex_viable_please/