I have made the switch on my duty rifle from the EoTech 551 to the Aimpoint PRO...wow. Should have done so a long time ago. Now I also need a second PRO for the home defense AR and then there is the play/training carbine. Neither the home defense or training rifles ever had a red dot so they will be new. I will have to purchase a second PRO for the home defense rifle; however, I thought about something cheaper for the play/training carbine. This is not a rely your life on tool. Don't want to spend the kids college savings on optics so I thought about the Primary Arms M3 style red dot sight (https://www.primaryarms.com/Primary_...0red%20dot.htm).

Does anyone have any experience or thoughts on this optic? Just wandering if it's durable enough to hold a zero and normal range use (no water, no dropping, no real hard use, etc.) What do you'll think?