Nothing that isn’t high quality - Burris AR-Tripler Rifle Scope w/ AR Pivot Ring

The mount is very well constructed, nifty pin to hold the tightening nut (see the instructions) and very nice quick disconnect arm. The mechanism to release and rotate has a well made feel and is easy to operate. The optics seem very clear, excellent really. It’s easy to center your scope dot in the multiplier with the provided tool (really a very thin screw driver). Eye relief is adequate but it must be mounted as far back on the rail as possible. This lacks nothing IMO. Can’t speak to how well it holds up but all indications are that it will work well for a long time.