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M21 (Practice Hand Grenade)
The M21 is a US-developed light blue coloured, hollow, cast iron, hollow-bodied, practice hand grenade, which is the practice version of the US Mk II (Mk 2) series of fragmentation hand grenades. The M21 can be found fitted with the following mechanically-fired, pyrotechnically-delayed, igniferous-output, time (4-5 s) fuzes: M10A2; M10A3; M205; M205A1; or M205A2. The base of the M21 has a opening, which is closed with a low-density stopper,...
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