buying my brother a wah pedal for his bass guitar, no idea about anything bass. Hes into mainly metallica and other old school metal. Would the Dunlop 105q be suitable for that? Im looking at used for about $60
get a morley power wah boost if you can. or just a morley power wah.

I've got one and it works great for bass. especially since Cliff from Metallica used one.

I had a 105q, and it was ok, but the Morley was so much better.