The SAR 21 (\"Singapore Assault Rifle - 21st Century\") is a bullpup assault rifle designed and manufactured in Singapore. First revealed and subsequently adopted by the Singapore Armed Forces in 1999, it was intended to replace the locally license-built M16A1. Many of its design features are directly intended to counter the weaknesses of the M16 as encountered operationally by some infantrymen.Made of a rugged, high impact polymer, most of the manufacturing is done utilising CNC machines, with ultrasonic welding for the steel-reinforced receiver halves and the gun barrel being cold hammer forged. It uses a modified Kalashnikov/Stoner operating system, boasting higher reliability and lower recoil. The translucent magazine allows precise assessment of current ammo load.The SAR 21 is also the first production assault rifle of its class to incorporate a built-in Laser Aiming Device (LAD) (powered by a single AA battery) as standard. The rifle incorporates various patented safety features, such as a Kevlar cheek plate and overpressure vent that protects the shooter in the unlikely event of a chamber explosion or catastrophic failure. It also has an integral 1.5x optical scope that is built into its carrying handle. The scope aids in target acquisition, particularly under low light conditions. The scope is factory-zeroed, and requires minimal further zeroing to suit different users. This minimizes non-training range time.