This is the most reliable ar15 setup you can have. Piston Driven with adjustable gas. 

11.85" Factory Built Piston Upper - Mod 2

radian / pws charging handle 

dead air keymo muzzle 

Lantac Lower 

braided buffer spring 

heavy buffer 

rise 2lb trigger 

magpul bad lever 

upgraded Premium Lower Parts Kit

Atrius 3 Position FRT (tuned perfectly) 

votex razor 1-10 with scalar works mount with upgraded throw lever  

build Cost 

PWS Mod2 Upper $1495

Lantac Lower $200

Atrius $250

Trigger $200 

Razor 1-10 $2000

Scalar Mount $350

Braided Geissle Super Buffer Spring $50

Heavy Buffer $50

Buffer Tube / Stock $100

uograded LPK $100

Emissary Grip $50

Dead Air Muzzle $90 

over $5,000 Build and like new !! Ultimate Reliable AR15 with best parts built to outlast all the others. 

willing to trade around for 2011's, scar, other high end guns!!