Those fluted FP's first came out on the mid thirties right? I have a 1920 Commercial, haven't seen it yet, I bet it won't have the flutes. This supposedly NRA Excellent DWM has a Mec-gar mag, so I suppose the value being less (Drum roll, here it comes) would it detract significantly from the value if I made flutes in the FP per photos I've seen? I have a complete commercial machine shop, so it would be done nicely. Is the hardness such that it would have to be form ground in a surface grinder or will a carbide ball end mill cut it? From blown up photos it looks like the three grooves are about .015" deep.
Thanks.

Too much work to cut your own flutes unless doing that is an enjoyable pastime for you... break one end mill in the process and you have already lost more $ than a new firing pin.

I would just buy a replacement firing pin with flutes and keep the old one as a spare... or sell it.

Hmm, they must be cheap. I doubt I'd break an endmill, with 30+ years experience, and I'll check the hardness when it finally gets here. If the old non fluted FP has collector value that's another matter though.

A replacement FP at one source said it cost $45 before shipping, That makes it worth doing many times over from my standpoint. There are 2 for sale in GB for starting no reserve price of $30, still well within "doable", as it would have to sell for about $15 from my point of view other than a collector standpoint.

My tester says the FP in my Mauser 1970's P-08 is 49-50 C in the area that would be dealt with. Carbide at low speeds will cut that, though the surface grinder doesn't care as much about hardness.
It's also possible that it's been replaced in 80 years with a relieved pin, I'll know soon.