That is JP's chassis system with there 700 clone custom action , IIRC it is made by Defiance for them . 4k for a rifle on one of the custom actions from one of the bigger smiths is about right .

Figure 1k for the action , 1-1.5k for the stock , 3-350 for a barrel , 125-250 for a trigger , and 100ish for a base and your about 3 grand for parts . Can you do it cheaper , yes depending on your parts choices but the cheapest custom action I know of is a grand and they only go up from there .