Original Item: Only One Available. Totally inert according to BATF guidelines with a hollow body and inert fuse. This grenade cannot be converted to an explosive device and is not available for export.

This is a great example of the M21 Practice Training grenade, an inert version of the iconic U.S. fragmentation pineapple grenade issued during WWII. The Mk II was standardized in 1920 replacing the Mk I of 1917. It was phased out gradually, the U.S. Navy being the last users, and on 2 April 1945 the Mk II and Mk IIA1 were re-designated the Mk 2 and Mk 2A1.
The Mk II was commonly known as a pineapple grenade, because of its shape and structure. Grooves were cast into the cast iron shell, which was believed at the time to aid in fragmentation and had the side benefit of aiding in gripping the grenade: this provision gave it the appearance of a pineapple fruit. The Mk II was identified with an all yellow body prior to 1943. They were then painted olive drab for camouflage purposes with a narrow yellow band below the fuse. There are numerous variations in the fragment and groove details that can be found, which seems to depend on the particular manufacturer.

This very nice WWII issue training grenade still retains the correct blue paint, showing wear from handling and age from storage. It comes with an original M10A3 fuse and pin, with the correct WWII style spoon. It is offered in very good condition. It has an open hollow end, as most practice grenades usually did.

A great example of a U.S. WWII Practice Trainer Grenade, complete with canister and ready to display!

The Mk II was commonly known as a pineapple grenade, because of its shape and structure. Grooves were cast into the cast iron shell, which was believed at the time to aid in fragmentation and had the side benefit of aiding in gripping the grenade: this provision gave it the appearance of a pineapple fruit. The Mk II was identified with an all yellow body prior to 1943. They were then painted olive drab for camouflage purposes with a narrow yellow band below the fuse.

Mk.II WWII 1944-1945
In the closing years of WWII the Mark II was produced with a solid base with the M10A3, or M6 series fuze (depending on the explosive filler used). The yellow band around the neck of the body was standard.

The are numerous variations in the fragment and groove details that can be found, which seems to depend on the particular manufacturer.