SUSAT

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The Sight Unit Small Arms, Trilux, or SUSAT, is a 4×

SUSAT was the primary sighting system for the British Army's SA80 series weapons and L108 and L110 light machine guns. It was also mounted to L7 and L111 machine guns. It was phased out and replaced by ACOG and ELCAN sight units during mid-life upgrade programmes. As of March 2019 it is still in use with much of the UK armed forces - primarily reserve, rear-echelon and for training use due to budgetary constraints.

It is (or has been) also used by the armies of

A similar unit known as the

Reticle

The reticle of the SUSAT is of unusual design. Unlike the traditional crosshair layouts commonly used, which are in essence a cross intersecting the target, the SUSAT has a single obelisk-shaped post protruding from the bottom edge of the sight. This type of reticle is sometimes referred to as the "German Post". This obscures the target at long range and the foreground. The reticle is tritium-illuminated for low-light condition aiming. The radioactive tritium light source has to be replaced every 8–12 years, since it gradually loses its brightness due to radioactive decay. The L2A2 SUIT Sight uses a similar single post to the SUSAT, but protrudes from the top edge of the sight down to the middle of the field.

Manufacturing

SUSAT is constructed from a one-piece, pressure

• Overall dimensions: (L x W x H): 145 x 60 x 55 mm
• Weight: 417 grams
• Magnification: 4×
• Field of view: 10 degrees (177 mils)
• Objective diameter: 25,5 mm
• Exit pupil: 6.375 mm
• Eye relief: 25 mm
• Light permeability: >80%
• Reticle illumination: Red tritium, glass ampoule
• Illumination strength: Adjustable
• Tritium ampoule lifetime: 8–12 years
• Focus: −0.75 to −1.25 dioptres
• Operational temperature: −46 to +71 °C
• Range Settings: 100 to 600 meters (SUSAT L9A1) or 300 to 800 meters (SUSAT L12A1) in 100 m intervals
• NATO Stock Number (NSN): 1240-99-967-0947 (Sight Unit Small Arms Trilux (SUSAT) L12A1)

See also

• C79 optical sight
• ACOG Optical Sight
• L2A2 SUIT Sight
• Specter

External links

• United Scientific Instruments—Official website
• SIGHT UNIT SMALL ARMS TRILUX (SUSAT)