The one i got works as it should - NcSTAR Micro Tactical Green Dot Sight w/ On/Off Switch

Mounted this on a Marlin 60 22 cal semi auto loader. NOTE: very tiny movements to adjust this little guy. After a bit found that about the width of the micro slot screw driver blade movement wise was all you needed. Took a bit but got it dialed in and was eating the heart out of the target at 25yards. The main reason I purchased this was for the low profile as I have other reflex sights that stick up a lot. The other factor was for a first time buy the price was right. Not much else I can say Optics planet does have a good return policy so the other sight I purchased when it came to be adjusted had no adjustment and it has been returned. Please that this worked out and can be used.