The Elcan Specter is a line of multi-role prism sights created by Raytheon ELCAN Optical Technologies originally designed for M16/M4 family of rifles but now also exists for light machine gun and heavy machineguns. Most of the optics are capable of switching between magnifications and illumination.
The Specter was developed by Raytheon Six Sigma Product Development Team under Raytheon ELCAN Optical Technologies for the United States Naval Surface Warfare Center to fill the requirement for the "SOPMOD rifle kit SU-230/PVS Articulated Telescope NSN 1240-01-533-09039", development was started in 2003 with the goal to fix the general issue of transition between long range engagements/operation to short range engagement/operations(CQB) that would leave the soldier vunerable while switching optics. The solution found by ELCAN was to merge a telescopic sight with a red dot sight by using a rotating lens one side at 1x magnification the other in 4x that could be rotated by the turn of a lever. Development was finished in 2006 where it won the bid 9-1 and was adopted as the SU-230/PVS. Since then more models have hit the market, [1] such as the stripped down Specter OS line developed as a cheaper alternative to the more expensive DR line developed for SOCOM, which lacks the capability to switch magnification making it function more as standard prism sight.
The optic has 2 standard reticles both are a cross, feature a range finder out to 600 m (656 yd) for 5.56x45 and 800 m (875 yd) for 7.62x51, where they differ is in the bulletdrop design where the one called CX5395/CX5396 uses circles to denote the range, while the other called CX5455/CX5456 uses lines and also features lines for windage. [2]
The OS line features two different reticles one is the SFOV4-C1 similar to the CX5455 except featuring a "+" as the center of the reticle, the other reticle for the OS line is an ACOG like type reticle with a chevron in the middle known as CX5755
The Optic is fitted to the rifle with A.R.M.S locking levers to a normal picatinny rail (MIL-STD 1913 rail) 70 mm (2.8 in) from the shooter eye. The optic is zeroed at 100 m (109 yd) range the azimuth/windage is adjusted in ½ MOA increments by flathead screwdriver on the front right of the optic and the elevation is adjusted in ½ MOA increments on the elevation zero dial at the back of the optic. The elevation zero dial has to be unlocked before it can be adjusted. The optic is capable of illumination, it can be turned on as a reddot or it can illuminate the entire reticle for night use. Illumination is turned on by turning the illumination dial on the left of the optic and the battery is located within the dial itself.
If the optic is a Dual Role (DR) model it has a lever in the middle that can be depressed and then pushed/pulled to switch between to set magnifications. [3]
The Tri-Role (TR) is the more unique optic in the line, although operation remains mostly the same except the changing of the magnification now happens on the dial on the left of the optic; it can only have a red dot as illumination; and features a different mounting solution.
Specter DR 1-4x [4]
Specter DR 1.5-6x [5]
Specter TR 1-3-9x
Current users:
Australia: The Australian Defence Force adopted the Specter DR 1-4x in 2016 [10] 
Afghanistan: Some captured by the Taliban from ANA forces during the pull out of Afghanistan [11] 
Canada: Used by Canadian Special Operations Forces Command [12] 
Croatia: Used Croatian Special Operations Forces Command [13] 
Denmark: Hæren adopted 3 custom versions developed jointly between DALO and Elcan in 2020. The models picked where the Specter DR 1-4x for 5.56, Specter DR 1-4x for 7.62 and the Specter DR 1.5-6x for 12.7 as all with a unique reticle and was adopted as a replacement for the ageing C79 [14] 
Germany: The Bundeswehr adopted the Specter DR 1-4x in 2021 to be delivered by Leonardo [15] 
Italy: Manufactured by Leonardo on a licence, [15] used by the italian military [12] 
Lithuania: Manufactured by Meopta under license for the Lithuanian Army [12] 
Norway: Hæren uses the Specter DR 1-4x [16] 
United States of America: SOCOM adopted the Specter DR 1-4x as part of SOPMOD Block II and designated SU-230/PVS
United Kingdom: The British Army adopted the OS 4x and designated it as the LDS in 2013 [17] Former users:
Islamic Republic of Afghanistan: ANASOC were supplied with SOPMOD Block II by the United States that included the SU-230/PVS(Specter DR 1-4x)
The Advanced Combat Optical Gunsight (ACOG) is a series of prismatic telescopic sights manufactured by Trijicon. The ACOG was originally designed to be used on the M16 rifle and M4 carbine, but Trijicon has also developed ACOG accessories for other firearms. Models provide fixed-power magnification levels from 1.25× to 6×. ACOG reticles are illuminated at night by an internal tritium phosphor. Some versions have an additional daytime reticle illumination via a passive external fiberoptic light pipe or are LED-illuminated using a dry battery. The first ACOG model, known as the TA01, was released in 1987.
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Raytheon ELCAN Optical Technologies, also simply ELCAN, is a Canadian optics and electronics manufacturing company owned by American defense contractor RTX Corporation, currently based in Midland, Ontario. ELCAN produces optical devices geared towards both civilian and military markets, and their products are sold through Armament Technology Inc. based in Halifax, Nova Scotia, and associated channels of dealers.
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