It's the Boyds T3 stock part #7GA114S451ZZ. I did have a problem originally but that is because Boyd's messed up the inletting. The front action screw holes were offset top to bottom. It was not a T3 vs T3x issue. It was just an issue. They made it right and sent me a new stock which fit perfectly. The bottom metal is aftermarket but the factory stuff fits the same.

My .260 Hunter (T3 not T3x) is currently in a T3X stock. Fit is perfect.