KevinB`s sticky is a must read and covers alot of those questions:
http://www.canadiangunnutz.com/forum/showthread.php?t=31083
Trijicon RX01NSN (Reflex)
The most compact of the sights tested, the Reflex, seems to have a love-it-or-leave-it following. The tritium light source provides battery-free operation and day/night hands-free operability. The yellow dot is easily picked out under most conditions, and the polarizing filter (included, but optional for use) can be tuned to achieve the best contrast against the target background. The 1/2 MOA click adjustments are made with an Allen key (slot would have been preferred), and are very positive.
The mount and sight body are fairly rugged. The hood on the Reflex is larger than most “heads-up" sights, which gives better protection to the fragile lens than the others. The hood also provides great protection from foreign matter on the dot reflective surface. There were some worries that the dot would be visible to the intended target, but that proved to be a non-issue. Accuracy was fairly good: 4" @ 100m out of a Colt M4A1, likely due to the way the dot clearly contrasted against the target and an aiming mark could be repeated.
The Reflex is compatible with both head- and weapon-mounted PVS-14's, giving day/night immediate readiness in either format. The Reflex is also compatible with the various bolt-on iron flip-up sights, and did not compromise their use. The lens cover provides a sacrificial window so that dirt, mud, and such can be quickly wiped off without damage to the lens proper (but you really don't need to). The body in no way obscured the FOV.
No nasty electronics to corrode and a nice, fast dot.
The only problem was the requirement to adjust the polarizing filter repeatedly in different lighting conditions as the dot would ghost against certain backgrounds - this is definitely a concern however it has been liekn to adjusting the brightness of a EOTECH or AIMPOINT, I'm not sure if I buy that - but some who have them still enjoy them (they where pulled out of the SOPMOD kit for the Aimpoint [and in certain unit the EOTECH])
EOTECH 552
We issue the EOTECH 552... :wink:
With the 552 are a 500hr battery life from a AA battery - and you can use the Lithium AA's for more and better low temp performance, and 8 hour auto shut off (for those who whine about that - nowhere are you going to leave the sight on one setting for 8 hours while using it) The EO as well has its own built in mount (so you save on cost - I think the Larue mount for it is a good investment but not necessary unless you really need that 1/10 of a sec gain for being a wee bit higher).
FOV is excellent
I think the EO 553 will be the HEAT - it was designed with feedback from CAG shooters in the US, from their issue 552's - Lithium123 batteries, taller and throw lever mount. -- IF it is ever released to the civilian market.
However the EOTECH's are still a CCO with 1x properties - they are good for CQB but lose their edge as distance increases.
