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The Aimpoint CompM4 And CompM4s
Since their inception in 1975, Aimpoint have dominated the market for high quality red dot sights. Aimpoint set out to eliminate parallax – according to US Army testing, Aimpoints are parallax free at ranges of 25 meters and greater. This makes the Aimpoint the theoretical equal of any scope, target size and range permitting. Aimpoint’s original market was Nordic hunters who only buy sights that work in extremely cold and wet conditions. From the outset, Aimpoints were designed to operate in climatic extremes and on heavy recoiling weapons. When they decided to go into the military market in the early years of this century, waterproofing depths were increased, NV compatibility was added and the sights were made to fit MIL-STD 1913 Picatinny rails.
The US Army adopted the Aimpoint CompM2 as its first general issue combat optic, standardizing it as the M68 in 2002. The US Army had worked its CompM2 red dots hard for six years before it started to look for a replacement. The use of a scarce and expensive battery, either the 2L76 or DL1/3N battery didn’t help. Aimpoint’s Circuitry Efficiency Technology managed to extract 10,000 hours or a little over a year of continuous operation out of that battery, which was impressive at the time. The sight was configured as a 30 mm tube with a 38 mm objective housing which meant that any rings used had to be split. Another problem was that the sight could be set up out of alignment in its rings leading to cant related errors in shot placement. The sight was equipped with six daylight and four NV compatible settings, but the 4 MoA dot traded accuracy for fast target acquisition. This sight is very sturdy, but had a vulnerable and relatively fragile adjustment knob.
Aimpoint knew they could do better and kept improving their range whilst keeping the excellent CompM2 in production. When the US Army wanted a replacement CCO, Aimpoint had been through another two development cycles and had a vastly improved sight ready. Advanced Circuit Efficiency Technoloy had been introduced on the CompM3 which was outwardly otherwise a CompM2. ACET boosted the battery life of the resulting Aimpoint CompM4 up to an amazing 80,000 hours, or over 8 years, at a day setting. Rather than the much criticized best results. For additional precision the dot size was brought down to 2 MoA and the number of brightness settings increased to 7 NV compatible and 9 daylight. The most major change switched to a straight tube that screwed down onto one of a range of mounts. The standard mount is a thumbscrew operated Picatinny rail mount. Bolting to the mount makes cant related errors a thing of the past. The switch was made much more rugged and a KillFlash supplied to reduce the chance glint giving away the user’s position.
The CompM4 was purchased by the US Army in some numbers and was a popular private purchase, but the US Army wanted one more improvement before type classifying the sight as its new M68 CCO. The use of thick arctic mittens was facilitated by mounting the battery and adjuster housing at 2 o’clock. The US Army had the location moved to 4 o’clock to reduce vulnerability, although operations with gloves was made slightly less easy. The resulting Aimpoint CompM4s was then standardized and purchased in vast numbers. On the M4 and M16A4 is partnered with the M150 ACOG to give the soldier the choice of long and short range engagement capability.
A number of US companies make mounts to suit the CompM4. Some of the most innovative and best engineered Aimpoint mounts are made in America by GG&G. The GG&G mount is machined from 6061 T-6 aluminium and 4140 steel, type III hard anodized and phosphated respectively. GG&G use a patented lever system called the Accucam which adjusts to out of specification and worn MIL-STD 1913 Picatinny and Weaver rails. It can be swiftly detached and re-attached, retaining zero. The lever is long enough to provide excellent leverage and is easily manipulated by gloved hands, but curls in to avoid catching on equipment or clothing. The mount puts the sight at the right height for absolute co-witnessing with standard height A1-A4 iron sights of BUIS intended to emulate them. The sight is secured to the mount by screws. GG&G offer two versions of this mount. The standard mount puts the sight directly avove the mount whilst the cantilevered version pushes the sight two inches further forward to enable the use of rear mounted optics or NV including the Aimpoint 3XMag magnifier and the PVS-14 night vision device.
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