AT3 Tactical Optics and AR-15 Parts
High-Quality AR 15 Parts & Accessories by AT3 Tactical
Our signature line of parts & accessories – we keep the prices low by selling directly to the customer and avoiding distributor markups!
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- Lower Receiver Parts - AT3 Tactical (49)
- Red Dot Sights - AT3 Tactical (30)
- Uppers & Parts - AT3 Tactical (23)
- Barrels - AT3 Tactical (21)
- AR-15 Build Kits and Assemblies - AT3 Tactical (17)
- Bolt Carrier Groups - AT3 Tactical (12)
- Complete Uppers - AT3 Tactical (11)
- Buffer Tube Parts - AT3 Tactical (10)
- Muzzle Devices - AT3 Tactical (9)
- Gas Blocks & Tubes - AT3 Tactical (8)
- Handguard Accessories - AT3 Tactical (8)
- Charging Handles - AT3 Tactical (6)
- Handguards & Rails - AT3 Tactical (6)
- Tools & Cleaning - AT3 Tactical (5)
- Optic Mounts - AT3 Tactical (4)
- Backup Iron Sights - AT3 Tactical (3)
- Buttstocks - AT3 Tactical (2)
- Scopes - AT3 Tactical (2)
- Slings & Mounts - AT3 Tactical (2)
- Front Grips - AT3 Tactical (2)
- AR Furniture Kits - AT3 Tactical (1)
- Pistol Grips - AT3 Tactical (1)
- AT3 Swag - AT3 Tactical (0)
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- AT3 Tactical - Black (92)
- AT3 Tactical - Flat Dark Earth (54)
- AT3 Tactical - OD Green (50)
- AT3 Tactical - Pink (47)
- AT3 Tactical - Burnt Bronze (45)
- AT3 Tactical - Titanium (45)
- AT3 Tactical -Tungsten (45)
- AT3 Tactical - Gray (43)
- AT3 Tactical - Blue (25)
- AT3 Tactical - Red (25)
- AT3 Tactical - Stainless (9)
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AT3™Sale!
AT3™ FU-BAG™ AR-15 Lost Parts Kit – Springs, Detents, Replacement Components
Made an "Oops" with your New Build? You Detent-Launchin', Spring-Losin' Fool, you. We've all been there. Whether it's rolling the dice on that bargain bin LPK in your local...2 Options -
AT3™Sale!
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs – Set of 2
AT3™ Mil-Spec AR-15 Pivot Pin/Takedown Pin Detent Springs - Set of Two All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and... -
AT3™Sale!
AT3™ Tactical H2 Buffer (4.6 oz) for AR-15
The Best Fix for an Overgassed AR - H2 Carbine Buffer Weight This one-piece buffer weight with rubber head weighs in at 4.6 oz, and is ideal for improving recoil... -
AT3™Sale!
AT3™ AR-15 Gas Tube Roll Pins – Set of 2
AT3™ AR-15 Gas Tube Roll Pins - Set of Two All AT3 Tactical upper receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in... -
AT3™Sale!
AT3™ ALPHA Micro Red Dot Sight with Shake Awake and Cantilever Riser Mount
AT3's First Shake Awake Red Dot Sight The ALPHA represents the best - value, features, and usability - that you can expect from an AT3 red dot sight. This... -
AT3™Sale!
AT3™ AR 15 Ejection Port Cover C-Clip – Pack of 2
AT3™ AR-15 Ejection Port Cover C-Clips - Pack of 2 All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in... -
AT3™Sale!
AT3™ MOTHERFU-BAG™ – The BIG AR-15 Lost Parts Kit – Springs, Detents, Wear Parts,...
Launch a detent? Snap a spring? Don't get mad, just fix it with this AR-15 Lost Parts Kit! Alright, so y'all seem to like the FU-BAG. Like a lot. Which... -
AT3™Sale!
Armorer’s Wrench for AR-15 Multi-Fuction Tool by AT3™
This perfect tool for AR builds that allows installation & removal of barrel nuts, muzzle devices, rifle buffer tubes, and castle nuts. This tool includes: A barrel nut wrench that... -
AT3™Sale!
AT3™ Replacement Barrel Nut for SPEAR M-LOK and Pro Quad Rail Handguards
Replacement Barrel Nut for SPEAR and Pro Quad Rails This lightweight aluminum barrel nut works with all of the AT3 Tactical handguards. If you've damaged or misplaced your barrel nut,...$9.99Only$8.49 -
AT3™RECOMMENDEDSale!
AT3™ AR-15 Bolt Carrier Group (BCG) – 5.56 NATO/.300 Blackout – Black Nitride
AT3 Tactical is bringing you the best with this Top-Tier Black Nitride Bolt Carrier Group Getting a high quality bolt carrier group (BCG) that runs well in your rifle is... -
AT3™Sale!
AT3™ 1/2 Inch Crush Washer for .223/5.56 Muzzle Devices Compatible with AR 15
Time Your Muzzle Device with a Black Nitride Crush Washer from AT3 Crush washers are essential to replace after removing for replacing a muzzle device. Re-using crush washers can lead... -
AT3™Sale!
AT3 Tactical Limited Edition Sticker Pack #2 – by @andremuller.art
Grab A Limited Edition AT3 Tactical Sticker Pack While Supplies Last The new designs will make your shooting buddies laugh and jealous all at the same time. Printed with high-quality... -
AT3™Sale!
AT3™ Carbine Buffer Spring for AR-15
Carbine Buffer Spring for 6-Position Adjustable Buffer Tubes This spring will fit in any carbine-length buffer tube to complete your AR15 buffer system. This piece is ideal for repairing a... -
AT3™Sale!
AT3 Tactical Firing Pin Retainer for AR15 BCG
Replacement Cotter Pin for AR-15 Firing Pin From the first time you've stripped down your AR15, you've probably learned to hate the firing pin retainer. It can be hard to... -
AT3™Sale!
AT3™ Castle Nut for AR-15 Buffer Tubes – 10 Colors Available
Secure Your AR15 Buffer Assembly with a Steel Castle Nut This steel castle nut is an essential piece of an AR15 buffer tube/stock assembly. With standard cuts for use with...10 Options -
AT3™RECOMMENDEDSale!
AT3 Tactical 2 Stage Trigger Assembly for AR 15 – 4.5 lb Pull Weight
The Best Upgrade To Your AR-15 - Your Key To Faster And More Accurate Shooting! The AT3 2-Stage Trigger drops into your mil-spec lower for a huge upgrade to your... -
AT3™Sale!
AT3™ Enhanced Nickel Teflon AR-15 Trigger Assembly
A Simple Upgrade That Will Ultimately Improve The Accuracy And Performance Of Your AR The Enhanced Nickel Teflon trigger assembly features smooth, precision-machined engagement surfaces and Nickel Teflon coating that... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Buffer Retainer Spring
Mil-Spec AR-15 Buffer Retainer Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR buffer assembly and... -
AT3™Sale!
AT3™ 3x Magnified Red Dot Kit – Includes Red Dot, Riser, & 3x Magnifier
This kit combines the AT3 RD-50 PRO Red Dot Sight with .83" PRO-MOUNT Riser, and the RRDM 3x Magnifier for a versatile, accurate, and durable optic setup. This kit saves... -
AT3™Sale!
AT3™ RCO™ Red Dot Sight with Circle Dot Reticle and Variable Riser Mounts
The RCO (Rugged Carbine Optic) Does It All - Circle Dot Reticle, Night Vision Compatible, with Riser Mounts to Fit Any Long Gun or PDW Premium Features The reticle... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Selector Detent
Mil-Spec AR-15 Selector Detent All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR safety assembly and are... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Bolt Catch Spring
Mil-Spec AR-15 Bolt Catch Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR lower receiver and... -
AT3™Sale!
AT3 Tactical Limited Edition Sticker Pack #1 – by @setadriftart
Get the AT3 Logo, Plus 3 Unique AR Sticker Designs! Ya'll asked, and we listened. But we weren't satisfied just offering our AT3 logo stickers for sale - we... -
AT3™Sale!
AT3™ Mil-Spec AR-15 Selector Detent Spring
Mil-Spec AR-15 Selector Detent Spring All AT3 Tactical lower receiver parts meet or exceed Mil Spec. These parts are guaranteed to fit and function in your AR mag catch assembly...
High-Quality AR 15 Parts & Accessories by AT3 Tactical
Our signature line of parts & accessories – we keep the prices low by selling directly to the customer and avoiding distributor markups!
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