I was going to post about my latest build earlier, but I wanted to post the parts list. As an example of how you can go way overboard with a new toy of this nature, I present the following list. I don't have anything assembled yet, still gathering parts. So far I'm $3,251.38 into this AR.

Midway.com:
Midway # Midway Description
152626 Wolff Extra Power Buffer Spring AR-15 Carbine
664713 Wolff Extractor Spring AR-15 Extra Power
579110 MagPul CTR Buttstock Collapsible Mil-Spec Diameter AR-15 Carbine Synthetic Flat Dark Earth
532491 MagPul Maglevel Pmag Magazine AR-15 223 Remington 30-Round Polymer Flat Dark Earth
869774 MagPul MOE Pistol Grip AR-15 Flat Dark Earth
164927 MagPul MBUS Flip-Up Front Sight AR-15 Polymer Flat Dark Earth
792223 MagPul MBUS Flip-Up Rear Sight AR-15 Polymer Flat Dark Earth
918376 MagPul MOE Enhanced Trigger Guard AR-15 Polymer Flat Dark Earth
936520 MagPul Pmag Ranger Plate Magazine Floorplate AR-15 Polymer Black Package of 3
386289 MagPul CTR, UBR, ACS, MOE Enhanced Recoil Pad Rubber Black
512604 MagPul AFG Angled Forend Grip AR-15 Polymer Flat Dark Earth
116423 TangoDown Vertical Forend Grip AR-15 Polymer Black
295527 Vltor VC-1 Flash Hider 1/2"-28 Thread AR-15 Matte
437961 M16 Clinic Buffer Pad II AR-15
187501 DPMS Lock Washer AR-15
589236 DPMS Upper Receiver Stripped AR-15 A3 Flattop Matte
888007 DPMS Ejection Port Cover Assembly AR-15 Matte
335086 DPMS Barrel Nut AR-15 Matte
162377 Daniel Defense Barrel AR-15 5.56x45mm NATO M4 Contour 1 in 7" Twist 16" Hammer Forged Chrome Lined Chrome Moly Matte Pre-Ban
890124 DoubleStar Receiver Extension Buffer Tube 6-Position Mil-Spec Diameter AR-15 Carbine Aluminum Matte
350058 CMMG Gas Piston Retrofit Conversion Kit with Gas Block and 1-Piece Bolt Carrier AR-15 Carbine Length
588861 GG&G Receiver End Plate Loop Sling Mount Adapter Right Hand AR-15 Carbine Aluminum Matte
123930 PRI Barrel Nut Wrench AR-15
282711 PRI Gas Buster Charging Handle Assembly with Flat Latch AR-15 Aluminum Matte
189887 MidwayUSA Pro Series Tactical Rifle Gun Case 35" Polyester Black
116984 BlackHawk Single Point Storm Sling Nylon Bungee Black
639681 Timney Trigger AR-15 Small Pin .154" 3 lb Skeleton
593549 Model 1 Armorer's Action Block AR-15
683430 Aimpoint Replacement Red Dot Sight Cover CompM2, ML2, M3, ML3 Rubber Dark Earth Brown
691616 Aimpoint CompM3 Red Dot Sight 30mm Tube 1x 2 MOA Dot Matte

Brownells.com:
Brownells # Brownells Description
100-004-464 Midwest Industries Gas Piston Free-Float Forend
741-000-004 MGI Carbine Rate Reducing Buffer
231-000-063 DPMS Forward Assist Assembly
100-004-899 Phase 5 Tactical EBRv2 Extended Bolt Release
851-111-000 Smith Enterprise AR-15 Complete Bolt
100-003-639 Bushmaster Lower Receiver Parts Kit
234-902-101 Dewey Bolt Cam Pin
573-000-030 Falcon Industries Coyote Brown Rail Guard

AuctionArms.com:
DPMS Stripped A3 Lower Receiver

AmericanDefenseManufacturing.com:
American Defense # American Defense Description
AD-68C Cantilever Aimpoint Mount

I've wanted to do a full AR build for years. I also considered building a 6.8 SPC, but I figured I would spend more than I wanted just doing a 5.56 build.