I use this for Underground, Legendary Missions, Challenging Missions and Incursions.
Build as a whole:
https://i.imgur.com/x1fMZwe.jpg
Abilities: Pulse Tactical Scanner/Recovery Link/ Sticky Bomb Flashbang
Chest:
4% All Resistance/6% EAD/49% Ammo Capacity//234FA Mod/193FA Mod + 4% DTE
Mask:
5% Health on Kill/12% DTE//255FA Mod +3009 Health
Knee Pads:
14,493 Health/28%Disorient Res/16% DTE/55% Kill XP//261FA Mod +3,175 Health/2% Pulse Crit Hit Chance
Backpack:
12,851 Health/16% Burn Res/263FA Mod +2,942 Health/5% Pulse Duration/2% Pulse Crit Hit DMG
Gloves:
12% Assault Rifle DMG/12% LMG DMG/9% Skill Haste
Holster:
21% Reload Speed/2% Pulse Crit Hit Chance
Weapon slot 1: Big Alejandro LMG// Talents: Self Preserved/Meticulous/Cover Shooter
Weapon Slot 2: G36 Enhanced// Talents: Capable/Brutal/Ferocious
Big Alejandro Mods:
Extended Magazine: 111% Mag Size/4% Crit Hit DMG/3% Crit Hit Chance
VX-1 Scope: 18.50% Headshot DMG/4% Crit Hit DMG/2.5% Crit Hit Chance
Large Muzzle: 17% Crit Hit DMG/5.5% Headshot DMG/4.5% Optimal Range
G36 Mods:
Extended Magazine: 112% Mag Size/4.5% Reload Speed/4% Crit Hit DMG
Russian Red Dot Sight: 16.50% Accuracy/4% Crit Hit DMG/2.5% Stability
Large Muzzle: 16.5% Headshot DMG/2% Accuracy/2.5% Stability
Small Grip Red: 17% Crit Hit DMG/4.5% Optimal Range/5% Reload Speed
Hope that's formatted OK and it helps