Black Hole Weaponry used to offer a service where they'd take an MP10 barrel extension and fit it to one of their DPMS pattern barrels so it could be used with the MP10 bolt. But they don't any more.

I have to dig deeper, but I believe a DPMS barrel can be used as long as a DPMS bolt is used with it. One guy on smith-wessonforum.com said he modified an MP10 carrier to take a DPMS bolt