Marlin 1894 Parts

[Blue Steel Traveller]

I just had the loading spring screw snap off.  Fortunately I was able to get the pieces out.  Since this is the weekend there is no calling Marlin.  Does anyone know if this is a standard screw that I might be able to find at a hardware store until I can phone Marlin and get an actual replacement. It looks like a typical black  machine screw.

Thanks in advance