So, are you wanting a 16" or 20"?
I have a dpms 20" heavy stainless target setup I might consider, but would prefer entire rifle trade for a matching rifle since mine is dpms upper and lower. 160 rnds thru it- 100 for break in and 2 mags after I broke it in.
Here is the upper: http://www.cheaperthandirt.net/ARR521-7.html
Lower is all dpms. My grip and stock will stay with me.
Give me more detail on your rifle if interested.