M99A2S3 Stanchion

From Halopedia, the Halo wiki

M99A2S3 Special Application Scoped Rifle
M99 Stanchion.png
Production overview


UNSC Spirit of Fire[1][2]

Model series:

M99 Series[1]


Recoilless anti-matériel rifle[1]



208.7 cm (82.17 in.)[3]

Ammunition type:

APFSDS rounds[2]

Feed system:

7 rounds[2]

Service history

In service:

Post-Covenant War conflicts[1]


The M99A2S3 Special Application Scoped Rifle, also referred to as the M99A2S3 Stanchion is a variant of the M99 Stanchion created on the UNSC Spirit of Fire by Isabel.[1][2]

Design and development[edit]

Design details[edit]

The Stanchion is equipped with an inertia buffer that helps manage recoil[4] and a bipod that can be folded back and secured on the weapon. The rifle is compatible with an "ATLAS HISHOT PRO-X" smart-link optic.[1][2]


The weapon has a feed of 7 rounds. These rounds are penetrator darts that are covered in a Sabot, and Storage casing which is "full burn-up".[2]

Development history[edit]

The M99A2S3 was developed on the UNSC Spirit of Fire in its manufacturing block "23-CELL 14". It is based on a template by Isabel called "Isabel-2558-01-00023".[1][2]


During the Second Ark Conflict, the M99A2S3 Stanchion was used by Lance Corporal Sparks of Sunray 1-1, and had achieved at least 17 kills with it. Sparks also customized his weapon with tally marks for every kill, a Dazzle camo pattern, and two charms; a Scorpio charm and an ODST Talisman.[1]


List of appearances[edit]