Here's a link that might answer your questions regarding high volume / fast shooting with a Parker Reproduction.
http://parkerguns.org/forums/archive...hp?t-3076.html
"In Argentina we did six days of shooting & I managed to run 10,000 rounds through it in twelve shoots. Two of the shoots were over 2000 rounds each with the high one being just over 2500. The gun took all the abuse I could hand it. When you shoot 2500 rounds in a little over three hours you can imagine how many times the gun get's opened & slammed shut let alone how hot it gets....."