I've had a FF3 on my sa-459 for three seasons and 10 Gobblers, been perfect. I use a AM Defense quick detach mount so if it ever gave me problems I just flip the lever and pull it off and use the bead.
I used an aimpoint micro when I used to do 3 gun and it was great. They're expensive but you get what you pay for. If I hit that thing with a hammer I would probably break the hammer!