My do all Precision/Long Range/Varmint AR! I started with a 16" Sig Sauer M400 Carbine and added parts as follows!

Safarie Land Super Stock (Rogers stock)
Geissele SSA-E Trigger
Midwest Industries Gen II SS Rifle Length Float Tube
Voltor Low Profile Gas Block
American Defense 20moa Recon Mount
Nightforce NXS 3.5-15x50 NP-R1 HS

Still awaiting the following!

KAC Adjustable 200-600 Meter Micro Folding Sights
Rainier Arms 16" Select Match Stainless Fluted 8 Twist 223 Wylde Barrel
VG6 Gamma 556 Muzzle Device
Magpul MOE Aluminum Trigger Guard and MIAD 1.1 Grip
Nightforce NXS Compact 1-4x24 FC-3G Optic Instead of the 3.5-15x50 NXS