Well, I don't know if any of you like a challenge but I only riot shield and I figured out all the quirks to make it perfect. I also completed every riot shield challenge in less than a day.
Primary: Riot Shield
Secondary: Really anything you want I use MP9 or P99 depends on map (I use MP9 Extended Mags for bigger maps and P99 Akimbo or P99 Extended Mags; the MP9 could be used all maps but the P99 is really just a my liking type gun; Also please note you could use any Machine Pistol I just prefer MP9's iron sights and accuracy)
Lethal: Semtex, Throwing Knife, or C4 (I suggest Semtex before you get C4)
Weapon Pro: Melee (Speed sucks you will find yourself missing more than you already do despite being able to catch up to them)
At your perk is where it gets pretty crazy.
Tier 1: Scavenger Pro(It's an absolute must to have this first perk but if you are rioting before 39 I suggest Recon Pro; You need to pick up more concussions it's the key to your survival)
Tier 2: Hardline Pro (This isn't interchangeable, you'll see why later)
Tier 3: Sitrep Pro (Until you get Sitrep Pro, Stalker Pro works awesome; Reasoning as a Riot Shielder you are easily killed from back or side where you're not watching or have clue that the enemy is attacking from with this you almost pull the blind man effect where they know exactly where you are based on noise and can react)
Strike Package: Specialist [This is very tedious but I've gotten ridiculously good at doing this well]
"2" Kill perk: Quick Hands Pro (with this you now have the MW2 stun grenade and equipment throw speed crucial as you need the time to switch back without the extend stun grenade animation. Also this is where hardline kicks in it only takes one kill to get this with isn't a hard feat for anyone. [Only takes 1 kill]
"4" Kill Perk: Blast Shield Pro (with this you stop harming yourself with stuns that are thrown in a relatively short distance and enemy stuns/flashes do very little to you which opens up the time to run towards them and smash them to death or shield weapons and shoot) [Only takes 3 Kills]
"6" Kill Perk: Totally interchangeable I prefer Recon Pro as in acts as a makeshift UAV for the team and you don't have killstreaks so you are tryna be as helpful as you can or you could maximize you dominance and go Dead Silence Pro or Extreme Conditioning Pro, Dead Silence making it hard for them to track you and prevent falling damage say if you see someone out a window and wanna go rape him so jump out the window. And Extreme Conditioning providing you ultimate mobility as a riot shield keeping up with everyone.[Only takes 5 kills]
*Bonus* I prefer this class in objective based games such as Sabotage, S&D, and Demolition because I found out planting the bomb counts as 2 kills furthering reason to take bomb and plant as a riot shielder with this class. As you only need one more kill to get Blast Shield essentially just by planting.
This took amazing amounts of trial and error which pwned my K/d for now till I got everything I needed haha.