It should work.
As far as modifications, you can make any action work for any “700” inlet.
Option 1: buy the correct stock or send the one you bought to who made it, and have it inlet for your action.
Option 2: buy the stock you like. Place you action in it. Marked what mods need to be made. Brake out your tools (dremel, sanding blocks, socket, sandpaper, files, spray paint, and TAPE lots of TAPE) and take your time making the mods.