Big Fall Sale – Save up to 35% | Shop Now

Big Fall Sale – Save up to 35% | Shop Now

AT3 Tactical 5.56 NATO AR-15 Parts

5.56 AR-15 parts by AT3 Tactical, from BCGs to muzzle devices, and any AR part your rifle needs in between.

Showing 1–24 of 66 results

List

Grid

Filter

Sort

LIST

Sale!

AT3 Flatline AR-15 Rifle

(1)

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

RECOMMENDED

Sale!

(17)

AT3™ AR-15 Bolt Carrier Group Nickel Boron – .223/5.56 NATO .300 Blackout .350 Legend

Sale!

AT3 Spear M-LOK Handguard with Cerakote Finishes - 7 Colors

(727)

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

Sale!

AT3 Tactical Pro Quad Rail AR-15 Handguard with Cerakote Finishes

(308)

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

RECOMMENDED

Sale!

AT3™ AR-15 Bolt Carrier Group - 5.56 NATO/.300 Blackout - Black Nitride

(195)

AT3™ AR-15 Bolt Carrier Group Black Nitride – .223/5.56 NATO .300 Blackout .350 Legend

Sale!

(1)

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

Sale!

(1)

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

Sale!

AT3™ 10.5 Inch Complete AR-15 Pistol Upper - 10.5 Inch Faxon .223/5.56 SOCOM Barrel - With Nickel Boron BCG and Mil-Spec CH

AT3™ .223/5.56 10.5″ Complete Assembled AR-15 Upper – With Nickel Boron BCG and Charging Handle

Sale!

AT3™ Mil Spec Buffer Tube Kit For AR-15

(93)

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

Sale!

AT3 Tactical Rifle Kit with Lightweight Barrel FDE

(7)

AT3 Tactical 16″ 5.56 NATO Pencil Barrel AR-15 JNL Ready Build Kit – M-LOK / Magpul CTR

Sale!

AT3 Tactical Extractor for .223/5.56 Bolts - Black Nitride

(1)

AT3 Tactical Extractor for .223/5.56 Bolts – Black Nitride

Black Warhammer with BCG

(54)

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

RECOMMENDED

AT3 Tactical AT-15 M-LOK Builder Set - Lower, Upper, and SPEAR M-LOK Handguard

(9)

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

RECOMMENDED

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

(6)

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

AT3 AR-15 Billet Upper and M-LOK Handguard with Cerakote Finishes - 7 Colors

(164)

AT3™ AR-15 Upper Receiver and SPEAR Handguard Combo

RECOMMENDED

AT3 Tactical 3-Port Muzzle Brake

(57)

AT3™ AR-15 3-Port Muzzle Brake – 1/2×28 – 5.56 NATO – Crush Washer Included

AT3 Tactical Crush Washer - 1/2 Inch for 5.56/.223

(12)

AT3™ 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices Compatible with AR-15

Spare 5.56 Bolt in Black Nitride

(9)

AT3™ AR-15 Replacement Bolt – 5.56 NATO/.300 Blackout – Black Nitride

AT3 Tactical Billet Upper and Pro Quad Rail AR-15 Handguard Combo with Cerakote Finishes

(19)

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

AT3 Tactical 3-Port Muzzle Brake

(25)

AT3™ AR-15 3-Port Muzzle Brake – 5/8×24 – .300 BLK/.308 Win – Crush Washer Included

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

Black Upper with BCG

(11)

AT3™ Slick Side AR-15 Upper with Black Nitride 5.56 Bolt Carrier Group

Slick Side Upper with Ambi Charging Handle and Bolt Carrier Group

(2)

AT3™ Slick Side Upper with Bolt Carrier Group and Breek Arms Warhammer Charging Handle

AT3™ AR-15 A2 Mil-Spec Flash Hider with Crush Washer

(31)

AT3™ AR-15 A2 Mil-Spec Flash Hider – 1/2×28 – 5.56 NATO – Crush Washer Included