I recently acquired an 1866 Second Model receiver (only).

it is well worn, but serviceable.

it appears the Barrel Threads or buggered a little bit.

A 73 barrel will thread in about have way and then it gets tight.

Does anyone know the tap size for a 1866?

Or, or this strictly a job for a gunsmith/ machinist?

Thank you for any advice you can offer.

Dan Dyer

Broken Arrow, Ok