I've also built mine. It's basically an M4 but with a 16" pencil barrel. Much like a Colt 6720 except with midlength gas. Weighs 6.5 lbs.
The rifle came in around $1000, with the components listed below. I would replace the cheap RDS pictured with an Aimpoint H-1 Micro and come in maybe a little over $1500. With a blem or used H-1 I could come in under.
Daniel Defense Upper Receiver with 16" LW CHF barrel:
Receiver Machined from Aluminum Forgings 7075-T6
Receiver Hardcoat Anodize per MIL-A-8625F, Type III, Class 2
T-Marked Upper Receiver
M4 Feed Ramp Flat Top Receiver
Daniel Defense Cold Hammer Forged Barrel
USGI LW Profile Barrel, 16"
USGI 5.56mm NATO Chamber
Independently Certified Mil-Spec 11595E Barrel Steel
HPT (High Pressure Test, per Milspec) Barrel
MPI (Magnetic Particle Inspected, per Milspec) Barrel
Chrome Lined Bore and Chamber
1:7" twist
Manganese Phosphate Barrel Finish on entire barrel
M4 Feed Ramp Barrel Extension
MidLength Gas System
A2 Flash Suppressor
Taper Pinned Front Sight Base
Mil-Spec F-Marked Forged Front Sight
Magpul MBUS 2 Rear Sight
Magpul MOE midlength handguards with IWC QD sling mount
BCM® GUNFIGHTER Mod 4 Charging Handle
Daniel Defense Bolt Carrier Group
Bolt machined from Mil-Spec Carpenter No. 158® steel
HPT Bolt (High Pressure Tested/ Proof)
MPI Bolt (Magnetic Particle Inspected)
Shot Peened Bolt
Chrome Lined Carrier (M16/AUTO)
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Grade 8 Hardened Fasteners Key
Carrier Key Staked Per Mil-Spec
BCM® Tool Steel Extractor
BCM® Extractor Spring
BCM® Black Extractor Insert
S&W M&P-15 Lower Receiver
Receiver Machined from Aluminum Forgings 7075-T6
Receiver Hardcoat Anodize per MIL-A-8625F, Type III, Class 2
Beveled magwell to ease magazine insertion
Daniel Defense lower parts kit
Milspec trigger group
Milspec Un-notched Hammer
Magpul MOE pistol grip
USGI Trigger Guard
BCM® Milspec 7075-T6 Receiver Extension
Noveske endplate with QD sling mount
USGI Staked M4 Lock Nut
USGI H Buffer
Magpul CTR stock with QD sling mounts
VTAC sling (not pictured)
S&W M&P-15 marked Magpul PMAG
Dan Wesson