The P53 Enfield was the rifle musket upon which all others were to be measured. Some did not measure up, some surpassed it.
The majority of P53 that made it into the ACW were hand made vs the machine made of the Springfield. The Springfield that left the factory in the morn was the same as the one that left that night.
The quality of the P53 depended upon the mood of the man putting it together and more out the door meant more coin in hand.
Issues with poorly seasoned stocks, Ill fitting furniture, poor quality control etc were common issue with the P53s that made it here.
There is no known case of US troops, or CS for that matter, passing up the opportunity to exchange their P53 for Springfield pattern arms.