Hi Cris
I am well pleased with the scope,the Diamondback 4-12x40 has very good build quality and is on par with my Bushnell elite 10x40 scope.the PA and mag adjustment rings are both positive and feel well made.
I have just got a non AO version of the same model from a fellow member on here,and it was easy to re px for air gun ranges.The scopes I have are made in the phillappines.
I would recommend these scope's.
Les..