Build More, Save More | Get up to $220 Off! | Shop Now

Build More, Save More | Get up to $220 Off! | 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

List

Grid

Filter

LIST

Sale!

AT3 Tactical Flatline AR-15 Rifle - 5.56 NATO - Black

(1)

AT3™ AT-15 FLATLINE Rifle 16 Inch 5.56 NATO – 15 Inch M-LOK Handguard

Sale!

AT3 Pro Quad Rail - 7" Black

(307)

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

Sale!

(1)

AT3 Tactical AR-15 Barrel – 16″ – 5.56 NATO – Government Profile – Mid-length

Sale!

Lancer Advanced Warfighter Gen 2 30 Round AR-15 Magazine - Black

(4)

Lancer L5AWM GEN 2 Advanced Warfighter .223/5.56 NATO AR-15 Magazine – 30 Round

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

(725)

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

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

NEW

AT3 Barrel Builder Kit – 10.5″ 5.56 NATO Government Profile Carbine Length Barrel, Gas Block & Gas Tube

DAILY DEAL

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

(93)

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

Save 15%

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

(162)

AT3™ AR-15 Upper Receiver and SPEAR Handguard Combo

NEW

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

SB Tactical HBPDW AR-15 Pistol Brace

(6)

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

NEW

Colt M4 10.3" 5.56 NATO AR-15 Pistol - 30 Round - SBA5 Brace

Colt M4 10.3″ 5.56 NATO AR-15 Pistol – 30 Round – SBA5 Brace

NEW

Sig Sauer 516 G3 5.56 NATO 16" AR-15 Rifle - 30 Round - Short-Stroke Piston

Sig Sauer 516 G3 5.56 NATO 16″ AR-15 Rifle – 30 Round – Short-Stroke Piston

NEW

Sig Sauer 516 G3 5.56 NATO 16" AR-15 Rifle - 10 Round - Short-Stroke Piston

Sig Sauer 516 G3 5.56 NATO 16″ AR-15 Rifle – 10 Round – Short-Stroke Piston

Sale!

STNGR 11.5 Inch 5.56 Complete Assembled Upper w/ 10 Inch VYPR® Handguard, BCG & CH - 3 Colors

STNGR 11.5 Inch 5.56 Complete Assembled Upper w/ 10 Inch VYPR® Handguard, BCG & CH – 3 Colors

RECOMMENDED

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

(18)

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

NEW

AT3 Barrel Builder Kit – 10.5″ 5.56 NATO Government Profile Carbine Length Barrel, Gas Block, Gas Tube & BCG

(11)

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

NEW

AT3 Barrel Builder Kit – 16″ 5.56 NATO Government Profile Mid-Length Barrel, Gas Block & Gas Tube