The mk6 3-18 t3 is my oldest scope (started life as an h58 but got it upgraded later), got it in apr 2014, I've sold a lot of scopes since then, including a mk5 5-25x which i never even mounted since it had a pronounced "fish eye". Maybe I had a lemon ?
Mk6 still seems relevant based on length and weight and performance.
And in addition to the reticle, they added illum and the turret upgrades.
I have two 762x51 rem700s in KRG Bravos, criterion 20" barrels, the other one has a NX8 2.5-20x t3 which is what I'd buy today, for something in that class. But not selling the mk6 !!
And I was able to buy a sunshade for it from custom shop, which I used to use a lot as I had to shoot into the sun in the mornings.