Heavy use for over a year, still holding up - GunVault AR MagVault Rifle Lock

It seemed cheap out of the package, but it functions well. Key insertion and tumbler action are both much smoother than expected. Stays flush with the bottom of the magwell, so it's a great, discrete safety mechanism for storage if you use foam cases. Much better than cable or trigger locks, and you can even close the dust cover. Got mine in January 2019, I take it in and out I would guess at least once every two weeks or so for range or hunting trips, and this things barely shows signs of use apart from some carbon smudging from the bolt face.