WD-40 on a scope, since they may penetrate to the interior and cause fogging.
Check the turret covers to ensure they're tight and the O-rings intact, since this is the primary avenue for dampness to invade a scope. And check the hex screws on the mount and rings to confirm they are snug.
Under no circumstances should you disassemble a scope. If you do, the dry nitrogen inside will leak and your scope will become prone to fogging. Such moving parts as a zoom ring, BDC, or adjustable objective are factory lubricated and need no field maintenance.
As part of your annual maintenance program, you should test the BDC to ensure its gear teeth are not so worn that you've lost repeatability. Also, test the zoom for any crosshair wandering at different magnifications.
Though assault rifles are not sniper weapons and the recent proliferation of scopes on them cannot make snipers of regular infantrymen, this combination has nonetheless had quite an impact on small-unit combat in Iraq and Afghanistan.
U.S. Special Operations forces for the past decade have placed the Aimpoint sight on many M4 carbines, which dramatically improved close-quarters and low-light shooting. Using an electronic dot of light instead of a crosshair, these operators achieved faster target acquisition and higher hit probabilities than with open sights.
An especially impressive red dot sight, the EOTech 551/552 projects its reticle dot into a holographic viewer. No matter where your eye is—off-center, close, far—so long as you can see
Thousands of Aimpoint sights have seen service in Iraq and Afghanistan. This EOTech sight (Ft) is mounted forward of an AN/PVS-14 for night firing.
Leupold's CQ/T sight offers low magnification (1-3x) for close-quarters and medium-range shooting.
Jerry-rigged but it works, an American Gl's scoped M16A4 in Iraq.
that dot and put it on the target, your shot will go there. It's not just parallax free—parallax cannot exist in this sight! I've fired my EOTech extensively and find it the fastest and finest close-quarters sight I've ever used. My inclination toward the EOTech is driven as much by its wide field of view as by its impressive rheostat settings—22 different intensities.
Both the Aimpoint M2 military sight and EOTech 551/552 are compatible with Generation II and III night vision devices, allowing you to use them in tandem with an AN/PVS-14. It's possible to view them through PVS-7B goggles, too, but it's pretty tough to contort your neck for a proper sight picture. I don't recommend it.
Unlike these assault rifle optics, which do not magnify an image, Trijicon's ACOG (Advanced Combat Optical Gunsight) is a fixed 4x scope contained in a rugged cast body. The U.S. Army calls its ACOGs the Day Optical Sight, while the
USMC has dubbed it the Advanced Combat Optic. Fitted with a quick-ranging reticle and holdover lines, these ACOGs have been quite popular in Iraq and are found on thousands of flattop M4 carbines and Ml6A3s.
On its own initiative, Leupold has developed a specialty assault rifle optic, the Mark 4 CQ/T, which, unlike the ones cited here, offers variable
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