I figured that particular one was already engraved. I was mostly prompting you - unnecessarily it seems - to go down the roll your-own rabbit hole. For Form 1 stuff, I have this 80/20 philosophy:
If it is about 80% as effective as a decent commercial dingus, and weighs 20% more I'm happy. I don't spend weeks or months and squillions of dollars chasing the last dB in a lab environment, and it generally costs me about 10-20% of the store-bought thing.
End cap for an all titanium .22 can. Works a treat.
And if you do eventually make one, stick with 17-4 for the blast baffle. Titanium blast baffles don't live long in high-pressure chamberings.