All categories
Every part for your AR-15, AR-10 and handgun, plus optics, magazines and range gear. Pick a department, or jump straight to a category.
Upper Receiver Components
1,667 products Shop all
149 products
Handguards & Quad Rails
114 products
Complete Uppers
121 products
Front Grips
132 products
Upper Receivers & Parts
362 products
Barrels
465 products
Muzzle Devices
122 products
Charging Handles
139 products
Bolt Carrier Groups
64 products
Gas Blocks & Tubes
147 products
Handguard Accessories
Lower Receiver Components
1,241 products Shop all
Sights, Optics, Lights, Lasers
544 products Shop all
Firearms
620 products Shop all
Build Kits and Assemblies
302 products Shop all
Handgun Parts
360 products Shop all
318 products
Glock Pistols and Parts
93 products
Sig Sauer Pistols & Parts
33 products
Springfield Pistols & Parts
5 products
Pistol Chassis
47 products
Handgun Barrels
192 products
Pistol Slide Parts
80 products
Optic Mounting Plates
101 products
Pistol Frame Parts
18 products
Handgun Triggers
14 products
Handgun Slides
17 products
Handgun Compensators
12 products
Handgun Magwells
Glock Pistols and Parts
Sig Sauer Pistols & Parts
Springfield Pistols & Parts
Magazines
370 products Shop all
225 products
Rifle Magazines
95 products
Handgun Magazines
59 products
Metal Rifle Magazines
36 products
Transparent Rifle Magazines
17 products
Pistol Magazine Baseplates
16 products
Pistol Magazine Extensions
9 products
Magazine Floorplates
8 products
Shotgun Magazines
7 products
Rifle Drum Magazines
4 products
Magazine Limiters
2 products
Magazine Followers
1 product
Magazine Dust Covers
Gear, Tools & Accessories
545 products Shop all
Shooting Gear
More ways to shop
By color or caliber, or straight to the best sellers and what is new.
Shop by color
1,395 products Shop all colors
Shop by caliber
1,855 products Shop all calibers
Great Selection on AR-15 Parts & Accessories
AT3 tactical offers a wide-range of top-rated AR 15 parts and tactical accessories. Build your ultimate AR-15 with our great selection of AR-15 scopes, AR-15 magazines, handguards & quad rails, best red dot sights, lower parts kit, iron sights, upper receiver, AR barrels, and more! We also carry AR-15 accessories from the top brands like Magpul, Aero & more!