AR Parts in 5.56x45mm NATO

KAK CQC Peanut AR-15 Pistol Buffer Tube Kit 3.3 oz

KAK CQC AR-15 Pistol Buffer Tube Kit 3.3 oz

AR-STONER AR-15 Enhanced Build Kit with Upper Receiver Assembly 5.56x45mm NATO 18" Barrel12" M-LOK Handguard, Complete Lower Parts Kit with Magpul MOE Furniture Black

STRIKE INDUSTRIES Latchless Charging Handle .223/5.56 FDE

STAG ARMS Stag15 AR15 Tactical Upper w/ 5.56 NATO 10.5" Nitride Barrel - M-LOK - Black

AERO PRECISION 5.56 BCG w/ 9310 Bolt-Blk Nitride

AERO PRECISION M4E1 Threaded Complete 7.5" 5.56 Upper Receiver

ROCK RIVER ARMS Comp UPPR Coyote 20"

ANDERSON M4 7.5" Upper 5.56 1-in-9 Twist

AMERICAN TACTICAL IMPORTS Complete Upper 5.56 16" 1:8 BBL 10" M-LOK BLEM

MAMMOTH ARMS 223/5.56 WELD SPRING

LMT STANDARD FULL AUTO BOLT CARRIER GROUP, 5.56

LMT LM8 MRP Rifle Length Slick Upper Receiver

LMT MWS Upper Receiver

LMT LM8MRP Wide Slick Upper Receiver

LMT CQB MRP Rifle Length Upper Receiver

KNIGHTS ARMAMENT SR-15 Upper Rcvr Assembled Notched for AR-15

GUNTEC AR-15 Spartan Flash Hider

GUNTEC AR-15 Spiral Flash Hider

CHIAPPA FIREARMS M-Four Gen II Pro Upper 11.8" 10rd - FACTORY BLEM

CHIAPPA FIREARMS M-Four Gen II Pro Upper 11.8" Blem/Refurbished

CHIAPPA FIREARMS M-Four Gen II Pro Upper 11.8" 28rd

16" 5.56 Mid Gas Fluted AR15 Barrel- Stainless

KAK CHF 5.56 NATO 16" Mid Gas AR15 Barrel- Nitride