Take a look at TWS OP I have two of the gen 2's and I love them. They lock up extremely tight and return to zero every time.
I don't see the advantage of side rail mounts like RS Regulate. Why have a mount extending from the side of the receiver, and running up the side of the gun in order to place a piece of pic rail above the dust cover when you could just have pic rail on the dust cover and be done with it. Less hardware, less weight, less bulk, TWS is the way to go.
Also consider the Redfield 2-7x. Great scope, large eyebox, lightweight, and very clear glass. Redfield is a Leupold company and Redfield's are rebranded Leupold scopes at a lower cost. I've got the Accu-range reticle in this one it has perfect hold over points for my 7.62x39 at 150, 250, & 300 yards, or for 556 at 200, 300, & 400 yards. I'm using these inexpensive UTG rings
(here's a link) to mount, and other than being bulkier than need be they, have perfect clearance for the scope over the front sight base, allow QD, return to zero, cost me next to nothing, and work great.