I am new to 1911s so please be gentle with me. Mine wont fire. The firing pin protrudes maybe 2mm from the keeper. With the hammer down and the pin flush the firing pin is still about 3mm from hitting the brass still deep inside the slide. If I remove the slide and take a tool and push the firing pin in it is well inside the keeper before the pin could contact the brass. New firing pin and it looks fine. I know it is not so but it seems the firing in OAL is too short, but, thats impossible. Driving me nuts! Thanks in advance for the help.