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M9 HE-DP (Pipe Bomb)

"The M9 High-Explosive Dual-Purpose grenade (M9 HE-DP) is the standard-issue hand grenade of the United Nations Space Command. The weapon is semi-erroneously known as a fragmentation grenade and the colloquial frag. Furthermore, the M9 designation technically refers to several models of varying design. Like most UNSC small arms and explosives, the M9 is produced by Misriah Armory.

HE-DP stands for High-Explosive Dual-Purpose. This designation means that it is designed to be effective against infantry and lightly armored vehicles.

The grenade has a hard metal casing, with a frangible design meant to break apart into small, regular shards. This surface creates consistent, reliable fragmentation patterns for the grenade, rather than randomly rupturing along metallurgical faults. The grid-shaped casing houses a charge of ComL high-explosive fitted with a mechanical primer. When the charge detonates, it shatters the grenade's casing, sending shrapnel flying away at high velocity.

The grenade is primed with a small button located on the "handle", quite unlike modern fragmentation grenades which use a pin that must be pulled before priming."