Original Item: Only One Available. Now this is a fantastic “SUIT” sight as used by Israeli troops during the Palestinian Insurgency in South Lebanon. The SUIT sight is a 4× prism sight with tritium-powered illumination, utilized at dusk or dawn. The full name is the L2A2 Sight Unit Infantry Trilux. The sight is not designed as a sniper sight, but as a standard issue infantry sight to improve the infantryman's night fighting capability and to assist target identification at long range in daylight and in poor light conditions.

The sight was mounted on the L1A1 Self-Loading Rifle or GPMG, or in this case the M-16 rifle with the use of the correct mounting bracket. The SUIT sight was developed in the United Kingdom by Royal Armaments Research Development Establishment (RARDE) and is manufactured by Avimo Ltd., now known as Thales UK. It was first produced in 1976 by Avimo Ltd. in London and is regarded as an early optical combat sight.

The SUIT sight was an optional optical sighting system for the British Army's L1A1 Self-Loading Rifle and was also used by the Australians and New Zealanders. It was not widely issued amongst nor used in combat by the British Infantry, Royal Marines and RAF Regiment.

A similar unit known as the SUSAT( Sight Unit Small Arms, Trilux) was fitted to the later SA80 series weapons.

The SUIT sight features a Bullet drop compensation (BDC, sometimes referred alternatively as ballistic elevation). The range setting feature consists of a selection lever to select a pre-determined zero cam for 300 metres (328 yards) (rear setting) or 500 metres (547 yards) (forward setting) range. The feature is tuned only for the ballistic trajectory of a particular gun-cartridge combination with a predefined projectile weight/type, muzzle velocity and air density. This selection lever is still present and does appear to be functional.

The reticle of the SUIT sight is of unusual design. Unlike the traditional crosshair layouts commonly used, which are in essence a cross intersecting the target, the SUIT has a single obelisk-shaped post protruding from the top edge of the sight so as not to obscure the target. The reticle is tritium-illuminated for low-light condition aiming. The Trilux radioactive tritium illuminator light source produces a red glow, that can be selected and brightness adjusted on the top of the unit and has to be replaced every 8–12 years, since it gradually loses its brightness due to radioactive decay. This optic is 46 years old and the tritium has long since decayed making it no longer visible.

The SUIT sight has an aluminum body, into which the eyepiece, objective lens and prisms are fitted as assemblies. The eyepiece is still present and is in one piece but is dried out with cracking present. The lenses are still crystal clear without any deformities that we have noticed. There are no crack or significant damage present in the aluminum body with nearly all original paint and markings retained. The labels are all in Hebrew and able to be read properly.

A wonderful, rare optic that comes more than ready for further research and display.