Does anyone know if the L and B pin plug screw is caliber specific on this Rossi? I have had Braztech ship me three screws now for one that came out somewhere. Each has been too small in diameter and falls into the hole. It will thread in if you open the action, but then the pin on the end doesn't allow the action to close as it protrudes into the slide. The head of the screw is 1/4 inch below the receiver, and in no way is this correct. The hole, just for reference, is on the left side of the receiver, opposite side from the loading gate, closest to the barrel and highest of the 4 screws on that side. Am I misreading the schematic and it's not the L&B screw?