Can a warlock with Pact of the Blade bind a non-magical weapon to be their pact weapon?

Question

In the warlock's Pact of the Blade feature description, it states the following:

... You can transform one magic weapon into your pact weapon by performing a special ritual while you hold the weapon. ...

This indicates to me that only magical weapons can be bound in this way. Does that mean a silvered weapon, adamantine weapon, or even just a entirely mundane weapon is unable to be bound in this manner?

(My question was inspired by this question about summoning a pact weapon that's already silvered.)

Answer 1

Going by RAW, you are correct: only magic weapons

The part you're quoting from the PHB indicates that magical weapons can be bound like this. Also backed up in Sage Advice.

So unless the silvered/adamantine weapon is magical, you can't bind it as your pact weapon. As for mundane, you can create them using the Pact of the Blade feature, as described in the PHB:

You can use your action to create a pact weapon in your empty hand. You can choose the form that this melee weapon takes each time you create it (see chapter 5 for weapon options).

Answer 2

In short, yes, only magical weapons qualify for this feature (PHB p.108).

The feature is further explained in the v2.2 Sage Advice, where it is again stated that the weapon has to be magical.

Using the RAF (Rules as Fun) approach, I would probably allow any weapon with even the slightest enchantment to be considered magical for the purpose of that feature.