DO NOT ******* DO THIS.
If you use the front action screw to pull the action down onto the lug you can and will damage the action, lug, or both. Don't force anything together, ever. That's how you **** shit up.
First make sure that the edge of the recoil lug or the recess in the action doesn't have a burr or a rolled edge from doing just thisl
The recoil lugs can be tight to seat sometimes even with a few thousands clearance if it's not perfectly square there will be a pressure point which will prevent it from seating. Even if it seats there will be a pressure point which defeats the point of stress free bedding.
I would recommend painting the bottom of the in and around with recoil lug area with a paint pen or something else thats a very thin coat, quick drying, and removable with acetone/alcohol. Carefully align and install the action into the chassis and put minimal pressure on it and make sure the barrel nor rear of the action are pointing up or down. You need to do this carefully for the recoil lug to properly mar up the paint to see where your issue is. Do this several times touching up the areas of contact with paint and cleaning the recoil lug each time to verify you're getting a consistent result to rule out any error of it not being seated down in the action straight.
Cross your fingers that it's the rear of the recoil lug that's contacting and causing the issue as this is a best case scenario as the front of the recoil lug and action even contact is most important. Then very very carefully with a fine jewelers file or 600grit sandpaper on a perfectly flat surface sand/file the RECOIL LUG in small increments until it properly fits. Do not under any cirumstances Then clean everything up and assemble.
It also wouldn't be a bad idea to bed just the recoil lug area to square everything up.
Or just return the thing to KRG and let them deal with exchanging a new one since your factory rifle thats a drop in fit doesn't drop in. It wouldn't be a bad idea to do the paint pen method even if returning just so you can confirm to them if the recoil lug isn't square.