I bought a SightMark reflex (not red dot) sight at Cabelas a while back for my Colt M-4 .22. This is the first reflex sight I've had. It has 5 brightness settings for the aiming spot, all noticeably brighter than the last. On the gun, in the house, any of the brightness settings were perfectly visible. However when I took it to the range, in broad daylight but under a roof cover, the aiming spot was completely invisible even at the brightest setting. With close inspection you could see that it was actually there but completely useless for aiming. I have returned it to the store but I got to wondering if this was normal? Doesn't seem like it should be but I've never had one before?