Okay, have a bit more time here now.
The setup I run with my Riot Shield is
Riot Shield - Melee
412's or Magnum
Throwing Knife
Concussion Grenades
Extreme Conditioning
Hardline
Sitrep
Specialist - Blast Shield, Assassin, Blind Eye
Know when to back off. Use objects and corners as extra coverage for yourself to help keep the enemy from strafing around your shield.
After your first melee, try to take a step back. This will help prevent knife through shield, headshot through shield, etc at point blank. Somehow when it's that close, the game acts as if your shield doesn't exist.
Try to only move when they are reloading or switching weapons. If they are continuously firing and moving forward, back up rather than moving towards them.
Practice with the throwing knife to get used to the angles. One of the easiest ways to kill someone is when they're not firing and waiting for you to move or switch to your secondary. Line up your shield where you know the throwing knife will hit them and throw. They may get 1-2 shots off before it kills them, but you'll usually win.
If you face overwhelming odds like 3 enemies running at you from one direction, you're pretty much going to die. Your best bet is to throw your throwing knife, which will usually get you at least one kill. Sometimes this has allowed me to actually get in and kill the other two enemies off with my shield melee after.
Try not to flash/stun yourself. Somehow I always seem to be stunned/flashed more even with Blast Shield Pro than the enemy I threw the grenade at. It makes a major disadvantage for turning your shield.
Be careful when picking up your throwing knife. I really wish they would make it optional to change buttons for picking them up, as I often end up picking up the weapon of the enemy who I just killed and their teammate decides to walk around a corner as I'm shieldless and in the weapon drawing animation.
A Semtex stuck to your shield with Blast Shield is not supposed to kill you. That doesn't mean that it won't. You are sometimes able to negate the blast of the Semtex by pushing your shield up against a wall or aiming it at the ground. Blast shield is pretty lackluster in this regard. You'll die pretty easily to most explosives even with it. When it does work, though, it's nice to hit them once, get the Semtex stuck to your shield, and then chase them until it explodes, giving you an assisted suicide kill and keeping you alive.
If you know you're in a connection where either you have 3 bars or your enemy has 3 bars, just try to not use the shield. It ends up not being worth it, because the lag affects it even worse. Not only are you less likely to be able to hit someone (often shield lunging towards their body, being against it, and getting no hit marker), but you are also less able to defend yourself.
Personally, I feel that the shield needs a bit of fixing. There are definitely times when I get killed by center shield shots or crouching still but the edges don't protect properly. I also fail to see why Riot Shield movement is slower than running with a Javelin out. I would love for an option for Scavenger to repair my shield or let me hold a button as long as it takes to get an enemy care package to repair it.
If faced with a Riot Shield, I find that hipfiring has a tendency to work better than aiming. Dual machine pistols tend to not care that a shield is there. Also, waiting for them to hit you once and then sprinting behind them and knifing them is an effective strategy.
but no tips tbh its a hard thing to use.
