I did a barrell swap, .357 to a .40 lone wolf. Went to the range, tried to rack the slide to load and found out the gun is locked up. I can pull it back about an inch and that is it. Not far enough to engage the little slider so I can take the slide off. What do I do? I see some recessed pins, will knocking them out allow me to get the slide off. I must have not installed the recoil spring properly.