Well I've started my 2nd AR-15 build and it's been a bit of a learning experience. In case anyone didn't already know, these things can get expensive if you're not careful! I stared at Surplus Ammo. And by the way these people are really nice to deal with. I bought their billet, flattop upper receiver and 1 of their nickel boron bolt carrier groups. Then I added a 16", stainless heavy barrel. It is a 1:7 twist with the polygonal rifling and a black oxide finish and the SAA 5.56mm Dragon's Head Muzzle Brake / Linear Compensator. I also got the 15" M-lock hand guard, the gas block and gas tube from them. From there I added a Magpul MBUS Pro LR rear flip up sight and a MBUS Pro front sight both of which I found on eBay. I picked up a Bravo Company Gunfighter ambidextrous charging handle from Cheaper Than Dirt (by the way, it wasn't cheaper than dirt) and this is what I have so far.
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