Upon further review - Sightmark 10-40x56mm Triple Duty Tactical Rifle Scope

I thought these looked great when I first bought one, so I bought two more. Big mistake. All three ended up back for warranty service because the reticle adjustments came off the tracks without a mechanical stop to prevent exceeding allowable adjustment.
The glass turned out to be typical Chinese Coke bottle junk that never quite focused and was very tiring on the eyes.
How many times do I have to (re)learn the lesson that "you get what you pay for", especially in Chinese optics.
Save your money and buy a Vortex or Bushnell. "Buy once, cry once".