Custom gallery from custom post types

Hi.
i have a Custom post type let’s call it “products”
and 1 product has a min. 3 photos they all display in single template.
Now i want create a page that can query all images from products and print it out.
I think i make a little mistake ;/
I try:
wpoutfitters.com
programmatically johnford.is

hmm mayby problem is in not a page-gallery but archive-gallery ?