I just want to make certain I am clear on this from your description:
You want a Colt "1" and "N" marked body ONLY?
No buffer, tube, castle nut, receiver end plate, latch, latch spring, latch bolt, or latch bolt nut?
Is this a correct statement? I don't mean to make it harder than it is. Just let me know, I may be able to help you out.