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 designed and developed over a four-year period and was intended to replace the locally license-built M16S1 by the Singaporean Ministry of Defense (MINDEF), Singapore Army, and the Chartered Industries of Singapore. It is used by the Alliance of Nations