The new ones are not worthy of the Aetec name, the old ones are simply great the new ones are simply cheap and nasty. I have the same model as you and apart from the sunshade not fitting all else is fine.

It's fitted to my .22lr and I have used it with my cobra merlin nv and it worked well enough to shot rats to 60 yards so for now its staying on the rifle but for how long I cant say.