I see you have chosen a different sight, but for those interested in a red dot, the Sparc is awesome, especially for the price point. It holds zero perfectly and comes with a lifetime warranty. My AR tipped over on the bench while "resting" on a Caldwell sand bag type shooting rest-during a period when I was firing my .44 Magnum Ruger Super Blackhawk. I caught the AR before it toppled completely.....well, I saw it going over and tried to catch it with my weak hand while trying to keep the cocked Ruger safely pointed downrange etc, and I did not do a great job of catching the AR and merely bumped the weapon back in the opposite direction and the Sparc hit the concrete bench. At least the AR did not go to the ground and took no damage at all, but the sight hitting bent the metal around the rear eyepiece. I contacted Sparc and asked if it was replaceable and if I could buy one and they said "just send it in we will replace it free of charge."
This is after they already replaced the first one I bought, no questions asked, because I thought the red dot could be better.
Here is a pic of the damage I did to the ocular eyepiece. The dot and red halo are just a camera anomaly in the way it dealt with the light.......my old iPhone 3g camera. The dot is not quite that big and you don't see that halo.
I mean, I damage the sight through my own negligence and they repair it free of charge with no questions asked, not even proof/date of purchase? Doesn't get much better than that. Now I have a pair of #4 Butler Creek flip covers on it.
The Sparc comes with all the spacers you need and a 2X adaptor and yes it is easy to turn on under stress.
Primary Arms one looks good. I'd not heard of that one. Please give a review when you have used it.