The ST Kinetics SAR-21 (Singapore Assault Rifle - 21st Century) is a Singaporean bullpup Assault Rifle developed in the early 90s and later adopted by the Singapore Armed Forces in 1999. Designed to counter weaknesses of the SAF's former M16S1 rifle, the rifle uses a modified Stoner operating system with higher reliability and lower recoil than the M16 and is constructed out of high-impact polymer. The SAR is also exported to the United States for police and civilian use by ST's subsidiary VT Systems.
The SAR-21 MMS (Modular Mounting System) variant appears in the Battlefield series, which replaces the SAR's built in sight with a Picatinny rail to allow mounting of various other optics.
It has the highest base stability and lowest recoil of any weapon in the game. To compensate for this, however, it also has the lowest rate of fire of any weapon in the Assault class, making the SAR-21 more difficult to use up close. This low rate of fire does have a few advantages, though; the ADS spread takes much longer to reach its maximum spread, allowing for a longer duration of sustained, accurate fire. The low firerate also conserves ammo, making the SAR-21 best suited for medium to long-range engagements.
The SAR-21 has very light recoil which makes it one of the most stable Assault Rifles in the game. Any inaccuracies lie within its side-to-side recoil, which can be mitigated using the compensator attachment.
It is quite usable with any optic, including the longer-ranged options. Which one you choose is all based on your personal preference.
Its lower rate-of-fire means it's a great option for Mid- to Long-Range engagements but can be outpaced in close quarters by many high fire rate weapons such as the M416 or the FAMAS.
After the Fall patch, the missing bullpup modifier is added to the SAR-21, allowing tighter hipfire accuracy and increased movement speed when aiming down the sights.
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- The SAR-21 shares its iron sights with the M416.
- The SAR-21 portrayed in Battlefield 4 is similar to the Modular Mounting System (MMS) variant, but it has longer overall length and longer barrel compared to its real-life counterpart.
- The SAR-21 is the only Singaporean made weapon with the U-100 MK5 Light Machine Gun in the game.