Choosing A Holographic Sight
Eotech make a huge range of holographic sights and it can take a while to pin down the exact one for you. However, each sight is a unique combination of features from which you can choose to get the sight which best suits your application. The Eotech holographic weapon sights have the following features:
Suitability for use with NV. Most sporting and law enforcement users don’t need NV and NV models can be a hassle to import or export. If you don’t want night vision, confine your search to the XPS2, 512, 516 and 517.
Cost. The cheapest Eotechs are those lacking NV settings – the XPS2, 512, 516 and 517 again.
Close mounting capability. Some models have their NV and brightness buttons moved from the rear to the left hand side to allow for very close mounting of NV devices or magnifiers. These models are the EXPS series, 556 and 557 (the 516 and 517 have this feature but are not night vision capable).
Mounting height. To enable co-witnessing in the lower third of the sighting window and to allow greater compatability with NV units, Eotech ship some models with a 7mm riser.These are the 516, 517, 553, 555, 556 and 557. The EXPS mount is 7mm higher than the XPS as standard.
Mounting system Three mounting systems are available for the Eotechs depending on whether you want the scope essentially permanently mounted (allen bolt), want to take it off easily, but in no particular hurry (thumb screw) or need to be able to swap quickly (ARMS throw lever). Thumb screw models include the XPS series and the 516, 517, 556 and 557. Throw lever QD models include the EXPS series, 553, and 555.
Cantilevered battery housing. Eotech offer models with cantilevered battery housings to clear the Delta rings of AR15 derived rifles. The XPS, EXPS, 516, 517, 556 and 557 are designed with this feature.
Length. Eotechs come in various lengths to suit different weapons. This is an important consideration with night vision rigs. Twin AA battery models are the longest, followed by the twin CR123 units, then the amazingly short, single transverse CR123 battery XPS and EXPS series. The XPS and EXPS are 3.5″ long, the 553 4.9″, the 556 5.0″, the 512, 516 and 552 5.4″and the 517, 555 and 557 5.6″.
Ballistic reticle. Only three models have ballistically compensating dots – the 557.AR223 is matched to the .223 round, the 552.XR308 to the .308 Winchester and the 552.XR500 to the .50 Browning Machine Gun. The 557.AR223 has side mounted brightness and NV buttons whilst on the 552.XR.308 they are positioned at the rear. The XPS2-2, XPS3-2 and EXPS3-2 offer a 2 dot reticle but this is not matched to a specific cartridge.
Batteries. Eotech have abandoned the use of ‘N’ batteries and now boast far greater battery lives. The choice boils down to AA or CR123 and there are often models that only differ in this respect (the 553 and 555 for example). The AA has significantly longer battery life when used with lithiums (1000hrs vs 600) but CR123 models are more compact. A single CR123 (transverse) is used in the XPS and EXPS series, two CR123s in the 516, 553 and 556 and two AAs in the 517, 552, 555 and 557.
Military endorsement. The main military use models are the 552 and 553 series – the latter specifically designed for and used by United States Special Forces COMand (SOCOM). The 555 is a 553 adapted to AA batteries and otherwise shares its heritage and specification.
Color. The 512 series is available in black, Mossy Oak and Advantage Timber camoflage. The 553.A65 is comes in black or tan.
Integrated laser. The EOLAD series are the only Eotechs with integrated lasers.
Copyright Chris Pieterman 2010.
MGS VR WEAPON SOCOM 01 [00:01:74]
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