Good a4/ acog backup sight - Gideon Optics Alpha Red Dot Reflex Sights

Got it on sale with 30 $ off so i took a chance. as i had a specific purpose for it.
surprised that having astigmatism and the green recticle is crisp! well constructed , good controls. different hardware to fit your mounting needs.(screws and pic mount) Glass is clear! ease of access for battery replacement. the shake awake feature works ( 3:45) and is very sensitive , a slight tap if that , is all it takes.

As previous reviewer correctly stated, the recticle does get larger at arms length, could be a con or pro..(would think for self defense application could be a pro , not so much for precision shooting? depends again on application)
For my application as a back up top-mounted green dot on a TA-31d-100582 USMC RCO this is not an issue.
the brightness level at high levels is very very bright! A+ in bright daylight .. its does have a very hard drop off at the lower levels though, seems to be as if you went from 4 straight to or 2 in brighness level, these could be the night vision settings but i have no way of testing that part of the optic, as i dont run NV gear.easily sighted in and accurate to 50yds and under and holding zero for 62 GR 5.56 (100rounds so far). another thing to note is the pictures do not match the glass coating.my unit has somewhat of a silver mirror like reflective tint rather than the pictured dark red anti reflective coating or tint. may be defeating the acog Anti reflective attachments. may need to find a cover for it. time will tell see how durable it is. so far it seems of very decent quality all around. would buy again on sale! Long list of Pros versus cons on this one for me.