Sniper Rifle System 99 Anti-Matériel

The Sniper Rifle System 99D Anti-Matériel, also known as SRS99 Special Applications , is a United Nations Space Command firearm.

Background
The SRS-99D first entered service with the Army in 2460. Because of its modularity and ongoing manufacturer support, the SRS99 was adopted by all branches in 2521.

Design Details
It is a gas-operated rifle, firing 14.5x114mm ammunition.

Trivia

 * The SRS99D-AM now utilizes a sling mount, unlike its successors.
 * The SRS99D-AM's scope is similar to the SRS99D-S2 AM's scope, with green outlines of objects. It will also show the ID of the user (in SPARTAN-B312's case, "ID-NOBLE6"). There is also a small UNSC logo on the left of the scope.
 * When the player carries this weapon, along with what seems to be the http://halo.wikia.com/wiki/M392_Designated_Marksman_Rifle, the player model now tilts their head as if looking into the scope, making it more realistic-looking.