I'm gathering the parts needed for my new upper to go on my .308 DPMS lower.  What low profile gas block should I use?  That's the only thing I haven't figured out.  Upper will be DPMS of course with a DD Lite rail and Hart barrel.

Ok, well can someone tell me if I can use one for an .223 AR15 like the Vltor one or are there specific ones for .308?

I used one from Yankee Hill Machine and it just barely doesn't clear the 4 railed DPMS handguard that I wanted to install.  Mine is an M4 contour barrel DPMS AP4 .308, any gas block for AR15's will fit if they have a 0.750" barrel profile.  The Bull barrels are around 0.950" or something similar.  I am going to dremel down the YHM low profile gas block to make it fit instead of buying another $60 gas block.  Plus, I have already test fired with this block and I know that if functions perfectly.