Picked this partially completed single shot 50 BMG receiver and barrel combo from a friend sometime back.
Was started by a "B. V. Mack" in "1957" as stamped on the bottom of the receiver.
Took it to another smith friend of mine, with a complete shop thankfully, and we started a working it over.
Several issues we corrected were:
Extending the tang and bolt stop block so the attachment screw could be removed without disassembling the bolt while it was still in the receiver
Removing the plates that were made to house some unknown trigger assembly
Working out the placement and attachment of the new trigger
Modifying the trigger's sear by adding height to it so it reached the cocking piece
Fitting the sear, cocking piece and bolt stop for proper operation
Cleaning up welded areas of the tang and stiffener under the receiver
Properly locating and tapping holes for the stock bolts and upgrading their size from 1/4x28 to 3/8
Straightening the firing pin tip
As it looks now
Still needs some work on the bolt safety, a replacement firing pin spring and drill and tapping the receiver for proper scope bases.
Waiting for the loan of 50 BMG reamers to finish the chambering of this short chambered barrel. Also of course the stock!
Have had lots of assistance in getting a large enough blank from several Cast Boolits members.
More to come!