Holosun 407c or 507c . They use the rmr footprint and can be had for $250-$300. They are very durable. I have 6 of them and have never had an issue after thousands of rounds.
Late to the party, but here is my take on it. Smaller guns that I carry all get an optic now. I can shoot them way more accurately and I don't need my Rx shooting glasses to do so. I can wear my normal contacts and feel confident on making a headshot out to 25 yards. I can not confidently do...