Up to 20% Off AR-15 Uppers & Accessories | Shop Now

Up to 20% Off AR-15 Uppers & Accessories | Shop Now

Black .223 and 5.56 AR-15 Parts

Need Black .223/5.56 AR Parts? AT3 has you covered – with fast & free shipping, hassle-free returns, and friendly customer service.

Showing 1–24 of 319 results

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Sale!

AT3™ Complete Rifle AR-15 Upper - .223/5.56 16" Ballistic Advantage Barrel - With Nickel Boron BCG and Mil-Spec CH

(1)

AT3™ .223/5.56 16″ Complete Assembled AR-15 Upper – With Nickel Boron BCG and Charging Handle

Sale!

AT3 Complete .223 Wylde Match Grade Upper Faxon Heavy Fluted Barrel

(4)

AT3™ Assembled Match Grade AR-15 Upper – .223 Wylde 16 Inch Faxon Firearms Barrel – No BCG/CH

RECOMMENDED

Sale!

STNGR Complete AR-15 Upper Receiver with 16 Inch Barrel, BCG and Charging Handle - VYPR Handguard, Black

STNGR 16″ .223 Wylde Complete Assembled Upper Receiver w/ 15″ VYPR® Handguard, BCG & CH

Sale!

AT3 Tactical 16 Inch 5.56 NATO Lightweight Complete AR-15 Upper Assembly - No BCG or Charging Handle

(10)

AT3™ Assembled AR-15 Upper – .223/5.56 16″ Ballistic Advantage Barrel – No BCG/CH

RECOMMENDED

Sale!

STNGR Complete AR-15 Upper Receiver with 16 Inch Barrel, BCG and Charging Handle - RPTR Handguard, Black

(1)

STNGR 16″ .223 Wylde Complete Assembled Upper Receiver w/ 15″ RPTR® Handguard, BCG & CH

Sale!

AT3™ Upper Receiver and Pro Quad Rail Handguard Combo

(19)

AT3™ AR-15 Upper Receiver and Pro Quad Rail Handguard Combo

Sale!

AT3™ SPEAR M-LOK™ AR-15 Free Float Handguard - 9 inch Length

(726)

AT3™ SPEAR Free Float AR-15 Handguard – 9, 12, & 15 Inch – M-LOK

Sale!

AT3 Tactical Spear M-LOK Free Float Handguard 9 Inch with Slick Side Billet Upper Receiver

(164)

AT3™ AR-15 Upper Receiver and SPEAR Handguard Combo

Sale!

2A Basics 5.56 NATO .223 Rem 16 Inch Complete AR-15 Upper Receiver - No BCG or Charging Handle

(2)

AT3™ 5.56 16″ Assembled Upper – 2A Basics ASAL Handguard – No BCG/Charging Handle

Sale!

AT3 Pro Quad Rail - 7" Black

(308)

AT3™ Pro Quad Rail Free Float AR-15 Handguard – 7, 9, 12, & 15 Inch – Picatinny

Sale!

Magpul MOE M-LOK Carbine Length Handguard for AR-15 - MAG424 - BLK

(85)

Magpul MOE Drop-In AR-15 Handguard – Carbine Length – M-LOK – MAG424

Black Warhammer with BCG

(54)

AT3™ Black Nitride 5.56 Bolt Carrier Group with Breek Arms Warhammer AR-15 Charging Handle

RECOMMENDED

(9)

AT3™ AT-15 M-LOK Builder Set – Anodized and Cerakote

(12)

Hexmag Shorty Compliant .223/5.56 NATO AR-15 Magazine – 10 Round

RECOMMENDED

AT3 Tactical AT-15 Quad Rail Builder Set - Upper, Lower, and Handguard - 15 Inch - Black

(6)

AT3™ AT-15 Quad Rail Builder Set – Anodized and Cerakote

(9)

Hexmag Shorty .223/5.56 NATO AR-15 Magazine – 20 Round

DAILY DEAL

MI 7" AR-15 M-Series M-LOK Two Piece Drop-In Handguard - Carbine Length

(2)

Midwest Industries M-Series Two Piece Drop-In AR-15 Handguard – Carbine Length – M-LOK

Ends Sunday

Save 25%

DAILY DEAL

Geissele CHF Chrome Lined .223/5.56 13.7 Inch AR15 Barrel

Geissele CHF Chrome Lined AR-15 Barrel – 13.9″ – .223/5.56 – Geissele Taper Profile – Mid-Length

Ends Sunday

Save 20%

OPEN BOX RETURN - AT3™ Mil Spec Buffer Tube Kit - AR-15

(93)

AT3™ Mil Spec Buffer Tube Kit For AR-15 – 9 Colors Available

NEW

Ruger Radial Muzzle Brake – 1/2×28 – .223 Rem / 5.56 NATO – Black

SB Tactical HBPDW AR-15 Pistol Brace

(7)

SB Tactical HBPDW AR-15 Pistol Brace

Duramag Speed AR-15 30 Round Aluminum Magazine - .223/5.56 NATO - Black Follower

(34)

Duramag Speed .223/5.56 NATO AR-15 Magazine – Aluminum – 30 Round – Black Follower

(11)

Bear Creek Arsenal 5.56/.223 / .300 Blackout / .350 Legend AR-15 Bolt Carrier Group – Nitride

RECOMMENDED

Duramag AR-15 Stainless Steel Magazine – .223/5.56/300BLK

(18)

Duramag .223/5.56/300BLK AR-15 Magazine – Stainless Steel – 20 Round