The AM also has an altered foregrip and stock as well as an altered body.

When looking through it, the scope (Oracle N-variant) seems to be down-graded considering the AM model's scope showed the target's elevation and distance and showed when the scope was leveled. First off, it is fitted with a 5x and 10x scope that shows real time images. The SRS99C-S2AM has some notable changes from the AM model. From the barrel to the breech to the stock, everything can be changed to fit the current situation and satisfy the operator. It features a barrel about 168.5 cm long and is completely interchangeable. The ejection port is located on the right side of the weapon and possesses a dirt cover. The bolt used to chamber the round is located on the left side of the weapon and moves during operation.

After a new mag is inserted, the bolt must be pushed forward to chamber a new round. Once the mag is empty, the bolt (although not illustrated in-game) locks back. Once the first round is fired, the gases from the previous round forces the bolt back and forth and continues to do so until the mag is empty. This powerful weapon is gas-operated and therefore must be cocked to load the first round. It is designed in the conventional layout, so the mag and operating system are located in front of the trigger.

The SRS99C-S2 AM is a semi-automatic rifle that fires 14.5mm x 114mm APFSDS (Armor-Piercing Fin-Stabilized Discarding Sabot) rounds from a 4 round magazine. It is modular, with the scope, stock, barrel and firing mechanism capable of being swapped to match a mission profile. It and its Covenant counterpart, the particle beam rifle, are the most accurate small-arms weapons in both arsenals. First introduced to the UNSC Army in 2460, the SRS99C garnered a significant reputation and was later adopted across the UNSC in 2521. The SRS99C is the primary sniper rifle used by UNSC and is featured in Halo: Combat Evolved and Halo Wars.

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