"Fragmentation grenades are very effective anti-personnel devices. The high explosive charges reduce their metal casing to flying fragments, causing considerable blast damage. Though they're ineffective against armoured vehicles, they are extremely useful for clearing out entrenched infantry positions."
This weapon is issued to the Soviet team. In Call of Duty and its expansion pack Call of Duty: United Offensive, all grenades are statistically similar. They have a damage range of 250-10 in single-player, and 120-5 in multiplayer, with a fuse of five seconds. They also have a melee attack dealing 50 damage with an animation similar to a pistol whip. The maximum number of grenades one can hold is 10, although in practice this only occurs in single-player. In multiplayer, grenade distribution is determined by the weapon one spawns with. Those equipped with a Scoped Mosin-Nagant receive one grenade; those with the PPSh-41 receive two; and those with the unscoped Mosin-Nagant receive three. Chiefly, in Call of Duty, players cannot be shellshocked by grenades.
In Call of Duty: United Offensive, the damage and max number of grenades stays constant, but a few changes are enacted. Players can be shellshocked by grenades. Grenades also have the ability to be cooked, where the grenade is armed but kept in the player's hand so that the fuse is shortened when thrown. Grenade distribution is totally changed as well; instead of being determined by the weapon equipped, it is determined by rank. Privates spawn with one grenade, Riflemen with two, and Platoon Sergeants with three.
The RGD-33 appears in Call of Duty: Finest Hour, as the main grenade in the Soviet campaign. It is the same with the Call of Duty, but is found more commonly, such as near starting positions and by killed NPCs, thus making the Stielhandgranate much more popular to use.
It appears in the Russian Campaign as the Russian primary grenade of choice. It is rare to get more than the starting amount, but it functions exactly the same as the other grenades. When the Player runs out, they will automatically switch to German grenades. It doesn't appear in Multiplayer or Nazi Zombies.
It's never found in boxes, and doesn't fall out from friendlies so they are quite rare.
In the mission "Executive Order", when using the binoculars to locate Grigori Weaver, it can be noted that he has two RGD-33s. They're also found on the uniforms of some Spetsnaz and Vietcong and on the disguises used by Woods, Bowman and Brooks. They're never used though, as they probably serve as an accessory to their skins.
They are also present in multiplayer, in some urban Spetsnaz pouches, though they're unusable, being only part of the character's model.