P Basses with narrower necks?

[Bortron]

Not if the item is sold here, but I agree with the rest of your post. If OP already likes the rest of the bass, just swap the neck out.

Just to clarify, the decal is a completely custom one, not a fake brand name! The bass is themed around a TV character so it's their name on the headstock. I've got no brand shame when it comes to basses, I've proudly gigged with Squiers many times.

 

[Kingofrock43]

Precision replacement neck (Jazz profile but says Precision on the headstock) on a P body. Fun projects and they play great.

 

[CallMeAl]

I didn’t see G&L SB2 mentioned yet, definitely worth putting on the radar.

 

[Exophysical]

Since you want to get a new 4 string, and you want a thinner neck, in addition to the Peavey Fury suggestions, may I also suggest the Squier Sonic Precision bass. Don't let the inexpensive price tag fool you - the one I have is very nice. It's got the jazz bass spec'd neck and the one I have is very stable with nice fret work. Now, I will admit that I did mod mine. The one quibble I had is that because of the light body, there was a bit of neck dive. So I solved that issue by changing the bridge to a Hipshot "A Style Fender Mount" bridge, and also replaced the tuners with GOTOH Res-O-Lite gb350s. Perfect now. And even though I found the pickups to be satisfactory, I did swap them with a Seymour Duncon SPB-1. I'm all set.

This. I love mine.

 

[Pep]

Buy a Jazz Bass neck online, slap it on there and call it a day.

What he said

These will fit perfectly.

J-Bass® Neck with Maple Fingerboard

The Mighty Mite Maple Fingerboard J-Bass Neck is a premium replacement designed to elevate your Jazz Bass's playability and tonal quality. Crafted from high-quality maple, this neck features a smooth fingerboard fitted with 20 medium jumbo frets, providing a comfortable and responsive playing...

mightymite.com

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