This guide will tell you how to use & unlock Riot Shield & Combat Knife together in Modern Warfare 2.
The Riot Shield will unlock at level 37 and the combat Knife will be unlocked at level 17. There is an issue that occurs while using the Riot Shield and combat knife together, it is because of your perk package. In case you have overkill on your weapon, then you have to equip a secondary weapon.
After this, go to melee and then you can equip the riot shield. To solve the issue, you have to equip a perk package that doesn’t have overkill. Then you can easily use these two items together.