Can anyone provide part numbers for the metal guide rod and metal mag catch upgrades to rid this gun of the plastic pieces, thanks in advance.

Try here

457 - MidwayUSA

The link that torizus provided to Midway shows a 457 recoil guide rod, S&W #239870000. In the S&W parts catalog that item# is only listed for the 457s so I believe that part is likely the same as the original, plastic.

If you want a metal guide rod I believe one for a 4516 will work. Do not get one for a 4516-1 though as it's the larger diameter guide rod for that single recoil spring revision. The 457 uses the smaller diameter guide rod for the dual/nested recoil springs, which the other 4516s (-0, & -2) use too, and is metal (S&W #108620000).

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Waiting for the break of day

thanks for the help, its appreciated