Noveske Rifleworks N4 Chainsaw Recon Complete AR-15 Upper Receiver - 5.56 - 16"

NOVESKE Chainsaw 5.56mm 11.5in Shorty SS Complete Upper (3003765)

NOVESKE Chainsaw 5.56mm 10.5in Mlok Complete Upper (3000529)

ALEXANDER UPPER RECEIVER AR15 - PISTOL 50 BEOWULF 12" TB BLK

BUSHMASTER M4 Type Patrolman Flat Top A4 Upper 5.56 16" Black

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector

AERO PRECISION AR15 5.56 NATO / 223 Rem 20" Complete Upper Receiver w/ Carry Handle | Black

ALEXANDER AR15 STANDARD UPPER - 300AAC 16" BLACK