You need to matchmake. Each main mission can be replayed on hard, and the 4 I named can be replayed on challenging as well. Go in with a random group of 4 through the matchmaking system. As long as you're level 30, start from the first main mission you ran (likely madison field hospital), and work to the last (U.N.), setting the difficulty on each to "hard". You'll be around130-160 when you get done, depending on how lucky you get with drops. When you've completed them all, head off to challenging mode. The incursion shouldn't be touched until your gear score shows 160, and preferably 180.
i hear ya, but every time i matchmake with them randoms, they don't like that i can't fully talk to them, i grew up speaking 2 languages, and because so i suck at both to be honest.
but i am having much luck at soloing the hards, i have been completing all of the ones you tols me, the one i found to be the easiest was Hospital right next to B.

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i now have a gear set of 108, and have gotten HE holdster, High end Neepads, a high end AK, and many HE mods.
ill upload the pic so u have an idea: of my items stats.
https://onedrive.live.com/redir?resid=9718557AE092D87F!822&authkey=!AFHs5pIx7vKGMm4&v=3&ithint=photo%2cpng
i honestly forget what all i have, but i got all those drops today, ohh yeah i also got a HE LMG, and i would give it to someone but i don't know how to give it to anyone. i think its a 182 GS
it almost feels like a 100% chance to drop a gear or Weapon on the missions on hard now, don't know if things changed, but the first time i played them i got HE gear on each mission. but when i replayed Hospital and it started giving me HE performance mods/Attachments each time.
if i keep playing the same one will i get another gear, and do certain missions only drop a few pieces of gear or do they drop different ones every time?