Kamen Rider OOO

The following weapons were used in the television series Kamen Rider OOO:

M203 Standalone Grenade launcher

In the 28th episode, "1000, the Kamen Riders, and the Birthday", both Ankh and Goto are armed with M203 Standalone grenade launchers while acting as bad guys in the supposed Kamen Rider OOO vs Shocker movie. A stuntman named In Sendo also uses the grenade launcher after switching the prop weapons Ankh and Goto are using to the actual weapons. This grenade launcher has a pistol grip and no retractable/fixed buttstock attached.

M203 Standalone Grenade Launcher made by KAC

Ankh and Goto, as actors dressed up to look like JGSDF soldiers on a film set within the television episode, aiming "actual" M203s at OOO rather than the prop launchers they were expecting to use. The swap out of the live launchers to the props was unknown to this pair of actors in the plot of the episode.

I can tell that the guy's dead serious with that weapon. Don't you?

Sendo after firing a live 40mm grenade at OOO, taking the grenade launcher from a confused Goto.

M26 hand grenade

Both Ankh and Goto have gray M26s attached to their vests. They were never used in "1000, the Kamen Riders, and the Birthday" as they were most likely props.

M26 HE Frag hand grenade

You can see the gray M26s on their vests.

Another shot of Ankh and Goto with the M26s on their vests.

Closeup of the gray M26s on Ankh's combat vest.