M228 Semi-Armor-Piercing High-Penetration

The M228 Semi-Armor-Piercing High-Penetration (M228 SAP-HP) is a 12.7×40mm round used in the M6 series of sidearms.

Overview
The round is somewhat rare and more of an exotic round due to its rarity of use compared to the M225 SAP-HE.

Due to the semi-armor-piercing nature of the round, it is likely coated in a hard metal such as steel but deforms shortly after impact to prevent the bullet from leaving the body and causing accidental casualties. The filler is likely a hard or heavy metal, such as tungsten, which would provide the extra force and penetration this round boasts of. It is possible that such synthetics such as Kevlar are used as well.

Gameplay
In Halo 2 multiplayer, the M228 SAP-HP is drastically underpowered, taking almost 13 rounds to kill a fully shielded Spartan or Elite.

List of appearances

 * Halo 2
 * Halo: Ghosts of Onyx
 * Halo Wars
 * Halo: Helljumpers
 * The Life
 * Halo 3: ODST
 * ''Halo Legends
 * Homecoming
 * Halo: Evolutions - Essential Tales of the Halo Universe
 * Headhunters
 * Halo 2: Anniversary
 * Halo Wars 2
 * Halo: Retribution