Dave,
I went out and checked nine of my Remingtons and they are about half and half integral pins/floating pins. All of the floating ones were on what Robert calls the improved lock. All of the integral pin guns were on the "standard lock". Thanks for the tip Robert. Im always amazed at what other people notice. I examined my two C grades side by side, compared them to each other and never noticed the different pin position that Robert pointed out or that the ARMS engraved on the older gun was engraved AMRS which Researcher pointed out.
I will look at the serial numbers on my guns and see what the different locks are.
Ross/Nebraska