on p-rails) for grenade target acquisition. Known sights to have been used include aiming quadrants, various optical sights and laser fire control systems. SAR 21 Picatinny rail Picatinny rail in place of its integral optical sight. The charging handle is moved to the side of the weapon and is interchangeable. SAR 21 Modular Mounting System (MMS) Has integral optical sight and LAD removed to allow a wide variety of add-on tactical accessories, such as vertical assault grips, tactical lights and reflex sights. Charging handle is moved to the left hand side of the weapon. Similar to P-rail model, variants consist of a standard and carbine-based barrels. SAR 21 Lightweight Carbine A lightweight SAR 21 variant was revealed during the Asian Defence Exhibition held in conjunction with 2006 Asian Aerospace. The variant boasts an ultra-short barrel, shorter handguards and a Picatinny rail RCF module The Round Corner Firing (RCF) module, similar in concept to the Israeli CornerShot, can be attached to any of the above SAR 21 variants for conducting operations in an urban environment. SAR 21A The prototype was unveiled at the Singapore Air Show 2010, this updated variant boasts a sturdier thumb selector for ambidextrous control, an unloaded weight of , a full built-in Picatinny rail along its length and a higher rate of firing at 900 RPM. In production as of 2012. Users : Replacing the FN FAL with the SAR 21 as of 2017. : Royal Brunei Armed Forces. : Indonesian Air Force, used by Korps Pasukan Khas special forces unit. : Special forces. : Singapore Armed Forces. : Special forces. : Special forces. References Notes Bibliography External links Official SAR 21 page at ST Kinetics SAR 21 Factsheet published by MINDEF 5.56×45mm NATO assault rifles Assault rifles of Singapore Bullpup rifles