Nice build. With a permanent flash hider, may I suggest a Enidine Hydraulic Buffer. It will knock what slight recoil the 5.56 has down to a .22LR.
http://www.botachtactical.com/enhyrebu.htmlFollow up shots and rapid fire drills are amazing. Like you, my Frankenstein build was primarily from reputable dealers online, and I was not disappointed.
It actually allowed me to make an AR a customized carbine. Which is the beauty of the platform.
Good call on the Omega Rail, and hand grip. Post a range report. Looks like a great AR.