Cannibalism of old for new, possible?

Just getting back into my old hobby I was never able to indulge in when I was a kid. Any and all advice is greatly appreciated!

My question(s) originated from getting a small lot on ebay of random nerf guns. I've got some of the "newest" highly talked about guns and I'm wondering if I can cannibalize any of the old guns for the new ones. Attachments, springs, sights, stocks, etc?

I've already have the spring and spacer mods for the nexus pro x, fury pro x, and xshot longshot.

Anything worth taking apart that could be useful?