After reading something I should of the first time I found out that the DPMS Gen 2 Recon (carbine) buffer tube is not like the others!
I bought this buffer and spring https://heavybuffers.com/ar10carbine.html and found out it won't work with the factory tube so the info I found out is I need VLTOR buffer tube to use the buffer and spring setup, the question is which one? This one https://www.vltor.com/shop/ar/receiver-extensions/re-1-ar-15/ or this one? https://www.vltor.com/shop/ar/receiver-extensions/re-10a5sr-a5-receiver-extension/
My guess would be the first one but I'm not sure any help would be great!