A 3-9x33 on a 10/22 takedown. I was going for QD but the only ones I've seen for 1" tube are a leupold and a Burris. Both look no better than a set screw with an added wing nut. Not exactly Larue quality. There probably is a wider variety of basic set screw type. I'm considering letting a dealer mount it because I'm not sure if the low rings are high enough but I'm unsure of the selection that dealers may keep in stock, not being one of the money makers like a Barrett or Motion Wave gun.