[DavidJayUden]

I recently acquired a bolo BH that was apparently worked over by the Broomcloset or similar Co. It is re-bored to 9 and re-blued. It is also very mismatched with some pitting remaining. Overall a very presentable shooter. It does, however, seem to drag the bolt on something beneath it, presumably the bolt stop block, as the bolt closes. If you close it slowly it remains about 1/2" open, if you let is snap shut under the spring load it usually closes completely. But at the range it does not fully chamber the round because of this drag.
Now here is the kicker: if you push back on the muzzle very slightly (sliding the upper back on the lower) it closes without interference.
Where do I start?
Thanks for your guidance.
dju