Mk 2 hand grenade

Mk 2 "Pineapple" World War II-made High-Explosive Fragmentation hand grenade (sometimes written Mk II). This example has a WW2-era fuze design as can be seen from the front of the spoon curling over rather than under the hinge at the front: this was changed postwar because the older hinge would sometimes allow the spoon to be pushed far enough forward to release the striker while still attached to the grenade.

Mk 2 training grenade (the blue training color has been painted to look like a live Mk 2) and also note the slight difference between the training dummy's body shape and the real thing. This is the most common version seen in films since no movie uses live ordnance and many productions don't bother trying to get mockups that look exactly like the live Mk 2.

Mk 2 blue practice grenade.