LaRue Tactical C.A.N. Click Adjust Nut QD SPR Mount 34mm Black. We suspect this because after nearly 1 million legacy LaRue mounts in Uncle Sams .mil system a system that has to be awash in 3/8 LaRue wrenches they came out with an optic solicitation that specifically specified tool-less adjustment. Fine well play. Introducing LaRue Click Adjust Nut aka C.A.N. mount. Its essentially our legacy LaRue Combat Proven QD mounts with the slight change of no wrench needed to adjust the lever to the Picatinny rail. You adjust it by clicking the proprietary thumb nuts much like clicking your scope turrets. Its very-fine click adjustment is real close to an infinite adjustment. Something interesting is you can count the clicks when switching optics between different uppers allowing you to predictably maintain the torque on each rifle (and yes you have to keep up with the scopes clicks but you have to do that anyhow). Specifications for LaRue Tactical C.A.N. Click Adjust Nut QD SPR Mount: Manufacturer: LaRue Tactical Color: Black Condition: New Package Contents: LaRue Tactical C.A.N. Click Adjust Nut QD SPR Mount LaRue Tactical LT204-34: C.A.N. Click Adjust Nut QD SPR Mount 34mm Black