How to gather 20 Metal Parts?!

[Disguised Poison]

I need them to make a Korek Machete. But it's taking forever to find enough MPs. In the meantime I need MPs to repair weapons too.

[DEVOLVE MINHA CACHAÇA!]

Trash cans, wardrobes, chests, tool boxes...metal parts are one of the most common raw materials available in the game.

[Blaze]

You can also dismantle weapons you dont need to get metal parts.

[Deadeye]

Or do this:
1.Go to a shopkeeper, he will probably have metal parts.
2.Buy the metal parts.
3.Sleep near that shopkeeper 2 times (i.e. wait till day once + wait till night once).
4.The shopkeeper will now be restocked with metal parts.
Repeat these steps until you have your desired amount of metal parts. This process is a bit tedious, but it works. If you play the game normally, and keep looting, you will have more metal parts than you probably need.

[Migel]

By far the easiest way to do it is to pick up trash, low level melee weapons and breaking them down to it's parts. Lead pipes, batons, khopeshs and whatever you find around.

[DedZedNub]

Exactly. Almost every weapon you find, like in the big green trash containers, can be dismantled for metal parts. The exceptions are the nailed plank and wooden plank (plus the soon to be extinct upon leveling nailed bludgeon). Those will dismantle into nails -- so you can build those up also.

You'll also find metal parts in other places, most notably either the green or blue trash cans all about in the scenery of Harran. Of course, other than that, nails and metal parts both will spawn almost anywhere.

[Disguised Poison]

Thank you guys.
You were right, the large garbage containers were the best. Especially those near a resting place ; )

[Poppi !!]

Best area ( one of ) for farming metal parts is in the Trainyard. Garbage containers all over !