If you're going to build an upper make sure you have a good torque wrench or know someone who does. And punches. Installing a YHM or Troy modular rail isn't hard at all. DD Omega HGs require the use of the delta assembly, which can be a little tricky on installing without the right tools. I much prefer YHM rails---cost effective, look good, and install very easily. Should you decide to build an upper, get this barrel nut wrench:
http://www.brownells.com/.aspx/pid=2...REL_NUT_WRENCH
and this upper vise block:
http://www.brownells.com/.aspx/pid=2...VER_VISE_BLOCK
Upside down or right side up---a very good receiver block.
Lastly should you decide you want to make your rail system go over your gas block, have a dremel on hand and the cutoff wheel setup and the green or orange grinding drums to create a teardrop profile for your gas block to fit under rails.
30 caliber junkie.
God Bless America.
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