Hello all. I have an opportunity to get my hands on a DPMS 6.8 spc 16" in like new condition for a fairly good deal ($900). The problem is I have absolutely no interest in this caliber. I got to thinking that with the modular design, it may be possible to change it over to 5.56. What would I have to purchase to do this??? Would I be better off just passing on the deal and purchaseing a new DPMS in 223? Thanks, Mark.