I pre-ordered the game when it first came out so I got the Recon UA/HUL helmet or something and I was wondering since I already have that attachment for the helmet than do I get the regular helmet for free?
Yes. Once you reach a certain rank you can buy it for 100k cR and another attachment.
No you will still need to spend 100,000 cR to get the Recon base helmet.
Sorry, but you still have to spend 100,000 cr for the base helmet.