Gnomon:
Obsessed is correct. Bushed strikers are almost always Birmingham/Provincial work, done to obviate pits around the firing pin hole. H & H never does this as a matter of course. They will do anything the customer wants, however.

Bushed strikers do not effect a gun's performance and should not be held against a high-level "shooting gun." Same with replaced or sleeved barrels as long as the gun's balance has been maintained.

Best, Kensal