Durable and reliable - SIG SAUER ROMEO5 1x20mm 2 MOA Red Dot Sight

This optic is mounted on my AR9. I have run over a thousand rounds through the AR9 with a Ghost rifles upper. So far it has held zero from the first time I zeroed it in. I plan on mounting this same optic on a .300 Blackout build, so we'll see how this hold zero with a more powerful round.