They drill from the back side to make the flash channel for fire from the nipple to reach the main charge then plug it with a screw & grind it flush. And no, it's not removable. They used to do it from the other side & seal it with a small screw & called it a 'clean-out' screw. So many people boogered them up & TC was getting covered up with warranty work to fix them so, they changed sides & made it non-removable.
I think it was from the manufacturing process, they needed to connect the bore to the bottom of the nipple seat.
Thank you. I thought it could have been a cleaning opening as I’ve seen it on other rifles. I appreciate your clarification.They drill from the back side to make the flash channel for fire from the nipple to reach the main charge then plug it with a screw & grind it flush. And no, it's not removable. They used to do it from the other side & seal it with a small screw & called it a 'clean-out' screw. So many people boogered them up & TC was getting covered up with warranty work to fix them so, they changed sides & made it non-removable.
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