Results for 5.56x45mm NATO AR Rifles

Guntec USA AR-15 Complete 5.56 Upper Receiver w/o Lower Parts Kit N.5 15in Ultralight Series M-Lok Handguard MLS Gen 2 Stock Assembly Carbine Length

Guntec USA AR-15 5.56 Upper Receiver w/o Lower Parts KitN.215in Ultralight M-LOK HandguardMLS Gen 2 Stock AssemblyCarbine .750 Gas Block16in 5.56mm M4

Bravo Company MFG (BCM) MK2 Standard Complete Upper W/RAIDER-M13 Handguard

Bravo Company MFG MK2 BFH 16" Mid Length Upper Receiver Group w/ MCMR-15 Handguard

Aero Precision Enhanced PRO Complete Upper, 16.3\" 5.56 CHF Mid-Length Barrel with 15\" Enhanced M-LOK Handguard - Anodized Black - APUG600218M103-1

Aero Precision M4E1 Assembled Threaded Upper Receiver, Special Edition: Thunder Ranch FDE Cerakote - APAR700219AC

Aero Precision - M4E1 No Forward Assist Assembled Upper Receiver - 16\" Barrel - .223/5.56 - APAR612218M7

M4e1 Superlative Arms Piston Complete Upper Receiver Groups - Piston Upper 10.5'''' Barrel 9'''' Handguard Blk