1 piece talley rings are the way to go - Talley Mounting Rings for Fierce Firearms

These Talley rings fit perfect on my new Carbon Fury rifle. I love the one piece design less to possible go wrong. I only thing I would suggest if your installings these yourself on a rifle have a long enough torx tip for you torque wrench. The screw that seats in the middle of the ring is tough to tighen if your using the stock torx tip that typically comes with the wrench. The stock tip is a tad but to short to tighten in my case.