This isn't an issue with the Woox chassis, it an uneducated/uninformed owner issue.

When it come's to Savage rifles and upgrading them it's the owner's responsibility to know what he or she has as he/she is the one with the gun in hand. The manufacturer has no idea what you have and it's the owners responsibility to ask questions and verify that a particular product from any manufacturer will fit their particular rifle in it's particular configuration. It's call doing your due diligence. As you have now discovered, there are a number of variations in components used on Savage rifles such as the recoil lug (standard or AccuStock), action screw lengths based on stock type, magazine types, trigger guards, bolt handles, top or bottom bolt release - just to name a few.

Just like you have to know how your vehicle is equipped when you go to the auto parts store to get replacement parts, you need to know how your rifle is equipped to know what aftermarket parts will be compatible with it. Helping people figure out just what they have and whether a particular part will fit their setup or not has always been a big part of why this forum exists.