That's pretty much exactly what I was gonna do. Mine came w/ the A1/C7 upper, but the barrel is the heavy 11.5"/5.5" (perm. attached.) I want to put a 14.5 M4 type barrel on it, but I like the heavy barrel better than the "government" profile. I think Jarrod misunderstood my request. They do have the 14.5M4 barrel in the catalog, but it's the slimmer configuration, not heavy.
I want the heavy 14.5 w/ the M203 step. Help me out, Jarrod. Thanks!