hunter64,
Not hard to remove, just need a castle nut wrench, I have the DPMS marked one I bought off ebay. If your going with triangular HG, you will have to replace the end cap thing, its attatched to the FSB on the norks, my friend had to cut his off, and ruined it. His looks goot with the triangular HG, and A1 length stock.
I think GunKote has a color called Colt Grey