Good sight - Sightmark Ultra Shot M-Spec 1x 24 mm Reflex Sight, 65 MOA Red Circle Dot Reticle

Holds zero and does its job. Considering the price that is a very good deal. I have used it on an M1A and a CZ 805 S1. I have not had any issues once the optic was zeroed on each rifle. After detach/reattach using the QD some fine tuning on the zero was necessary but that's normal for every mount under a boatload of money, isn't it? I would recommend this model. It's no Aimpoint or Eotech but it does the job and leaves you with some cash to get a decent magnifier or a couple of cases of ammunition.