This is a AR15 Pistol is 556/223 very nice build bufferless system asking $2,000 has brand new in box vortex UH2 to go with it. Build list below. 

UPPER

Odin works 223 wylde 10.5” pistol barrel

Odin works click adjustable gas block

BCM hand guard

Magpul fore grip

Allstar tactical muzzle

Aero upper receiver

Bcm gunfighter charging handle

Vortex UH2

 

LOWER

Allstar tactical lower receiver

Evolution industries buffer less TIN BCG

CMC trigger

Magpul grip

SB tactical folding brace