Need to read instructions - BSA Optics Sight System w/ Multi Purpose Reticle

Did not hold zero, until I read the instructions very carefully. There is a screw that has to be loosened, and then retightened after zeroing in. I have mine on a leapers handle mount on my Stag Model 3H.I can remove and replace the mount on the handle, and still be dead on.
Pros: compact, light, inexpensive.
Cons: adjustments screw do not always click

This review was written in the old system and had content requirements that are different than reviews written today.