Description: This is a 10k Powerhouse Reclaimer build for those who work in teams who prioritize healing, more than anything else. Dumping everything to Electronics, you will get the most powerful heals in the game that will sustain your team in almost any situation.
Please be wary that this build assumes that your teammates can dish out great damage. As it's a 2.9/2.9/10.2 build, your damage is mainly supportive. You compensate the loss in damage through persistent strong heals and frequent links. If you want slightly flexible build, you can use a 4.1/4.1/7.8 build instead. The difference is only the trade-off between unlocking desired talents or getting the most skill power. BUT, in my testing, unlocking damage-oriented talents can only go so far. So you're better off making sure your team is alive always.
You also have to be really cautious and aware of how the AI works in the Division, especially in Legendaries. This build is literally a glass healer.
Gear: The stats I included in this build are self-explanatory. Ideally, you'd want Disrupt Resistance for the backpack, but you can go for Ammo Capacity (for Resistance specifically). For the mods, you don't need all Skill Haste mods since you only need 35% (34% in build) Skill Haste, which will be added by the Support Station another 15%, which equates to 49% Skill Haste (1% near cap). Thus, you dump 2 mods into Skill Power instead.
I prefer Support Station Healing Range (7.5% x 4 = 30% Support Station Range) because I usually do Legendaries or Resistance, where your team usually hangs out in a single spot. I've seen other builds dump into Healing Speed, but I honestly prefer my team being able to move more freely.
I also did not put First Aid Ally Heal neither, because with such a high Skill Power, your heals are pretty much insane at this point.
Primary Weapon: I really love the LWM4 as always. The most important thing here is you must have Determined on the free talent, so your Link has faster cooldown on-top of your already fast Skill Haste. I run Talented so that the heals are boosted, Competent for additional damage as you spam First Aid onto your friends. Your gun mods are dumped mostly into Headshot Damage, as it's the most consistent damage you can have as long as you can hit headshots.
Secondary Weapon: As for your secondary, I use a Custom M44 with a Coolheaded free talent. Any sniper will do as long as your free talent is Coolheaded. This is your main way of rushing your link cooldown. At approximately less than 20 headshots, your link is going to be ready again.
I promise you, your teammates will love you. Even at your low damage, scoring headshots at standing NPC's while safely tucked in a godly support station, you'll be spamming links in no time. If you don't have this, you're pretty much handicapped in terms of constant usage of links.
Skills: Always use Life Support as it has the most heal per second. As for me, I use Defibrillator as my main fast revive skill. You can use Pulse for additional damage. As for talents, I use Combat Medic (40% heal to teammates in 20m), Triage (Heal an ally to reduce cooldown by 15%), Battle Buddy (Revive and get 30% damage resist for both of you), and Tech Support (Extend skill duration by 10% every kill).
Of course, finally, I use Tactical Link in most situations. It depends on the situation really. If your team is dumb as rocks, use Recovery Link. If you need to skip some parts of Legendaries, use Survivor Link. Tactical Link is most useful when you have a teammate who has a Sticky Flashbang because your team can shoot a cluster of enemies all at once (usually focusing the medics first).