Here are some weight differences of the Tikka stock and KRG Echo. My research before ordering wasn't finding a lot. This IMHO would be a well kitted factory stock vs a comparable Echo.
Factory stock with an aluminum pic rail (Seekins precision?) and a Mathew fabrication cheek riser and tool less adjust. 36 ounces.
KRG Echo with tool less cheek piece knob, short arca rail, aluminum L2 pic rail, and 3 LOP spacers weighs in at 46 ounces.
All in all not as much of a weight gain as I was anticipating.