The Rifle Grenade is briefly seen in the campaign mission The Crossroads. After the Flakvierlings are destroyed, Sgt. Dixon equips a rifle grenade on his M1 Garand and uses it to destroy a pile of crates blocking the passage. It is not available for use to the player in the campaign.
The Rifle Grenade can be mounted on M1 Garands or Kar98ks in multiplayer, issued to the Rifleman class. Rifle grenades will usually kill in one blast and have a large blast radius, and yet, anywhere beyond a meter, it will barely hurt the target.
Rifle Grenades reappear in Call of Duty: World at War as an attachment for rifles. They have a smaller degree of anti-tank ability than the Bazooka, but are easier to use against infantry. In campaign mode, the rifle grenade is only seen on the M1 Garand, and found in the missions "Hard Landing" and "Relentless". The M1 Garand's launcher is called M7 Grenade Launcher in campaign.
Unlike the Grenade Launcher in other games, it requires the player to complete the final Marksman challenge for a weapon (except the M1 Garand rifle, as it has a Sniper Scope as its final Marksman). Note that the Rifle Grenade has a greater ballistic arc than the grenade launcher.
It also moves slower and has a larger blast radius, and is noticeably more effective than the grenade launchers. Also, there is no safe arming distance. This means that players can shoot a Rifle Grenade at their feet and explode, which cannot be done in Call of Duty 4: Modern Warfare. The Rifle Grenade reloads faster than the Grenade Launcher but takes a longer time to switch to and from the attachment. Rifle grenades can only be equipped to bolt action and certain semi-automatic rifles in Call of Duty: World at War.
The adapters on the end of the barrel are bulky and awkward. The adapters on the Arisaka, Kar98k, and Gewehr 43 are so large they may obstruct a small portion of the sights during normal use of the rifle.
On the M1 Garand and Springfield version, the grenade is just a M2 grenade inside of the cup.
On the Wii version, a dot replaces the grenade launcher reticle. This also applies to several other weapons, like the M2 Flamethrower.
An error on the menu of attachments for the M1 Garand says it is unlocked at Marksman IV, as opposed to Marksman III, when it is actually unlocked.
If a player used up all their rifle grenades, then picks up some rifle grenade ammo, switches to the rifle grenade again; they will do the loading animation twice, as the first is the "switching weapon" animation, while the second is the "reloading" animation.