where can i find blueprints of the attachments for weapons?

On zombies and players, though if you find a research kit and some paper you can copy anything you find which is much more efficient than looking for every single blueprint.

Ok, thanks for your help…

Attachments are broken as of right now.

I Havent ever gotten attachments from zombies, only like 100 gun blueprints lol :o

the attachments are broken yet?

Yep, when you try putting them on your weapon the weapon disappear.