P38 byf

I just received a gift via a relative on a piece that was originally my grandfathers'. It's a Walther P38 with byf 43 and 8090 above the trigger and left case. I have been reviewing some earlier threads so it looks like a 1943 model outsourced to Mauser for the manufacture? The right side has markings of what looks like war eagles with the numbers 135 right below the eagles. This also appears above the trigger. The holster is in good shape and has P38 stamped very large with a war eagle and swastika with the number WaA869 plus and extra clip. I realize that these are common guns but can any competent gunsmith clean this up a bit? It is in good shape but I would like to get in the best shape possible. Another forum warned me that this gun is unstable and not to fire it as the workmanship is unreliable, especially a soft firing pin. Any experience with this piece?