I have a DPMS LR-308 that I want to replace commercial buffer tube and stock w/ a Magpul CTR milspec buffer and stock? I have read that they are the same between the .223 and the .308 and I have read that they are different. Will the buffer tube for an AR-15 work w/ the buffer spring and buffer from the .308 or will everything need to be replaced? This is purely for cosmetics (to match my AR-15), but not a necessity, so no big deal either way. What say you?