If there are 50% of 1903-A4 'recievers' left in the world today(roughly 14,000), I kinda doubt that 50 % of those have originql receiver Barrel combinations
When one takes into account aresenal/ field rebuilds/bubba...likely less than .05% Mint original if not less than that. Then one must have extreme documentaion to substantiate the likely cost of such a 'criitter'
I assumeing your question was actualy somewhat retorical.
JMO