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! READ MORE
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- Lower Receiver Parts - AT3 Tactical (49)
- Red Dot Sights - AT3 Tactical (30)
- Uppers & Parts - AT3 Tactical (23)
- AR-15 Build Kits and Assemblies - AT3 Tactical (17)
- Bolt Carrier Groups - AT3 Tactical (11)
- 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 (7)
- Charging Handles - AT3 Tactical (6)
- Handguards & Rails - AT3 Tactical (6)
- Tools & Cleaning - AT3 Tactical (5)
- Barrels - 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 (74)
- AT3 Tactical - Flat Dark Earth (53)
- AT3 Tactical - OD Green (49)
- AT3 Tactical - Pink (46)
- AT3 Tactical - Burnt Bronze (44)
- AT3 Tactical - Titanium (44)
- AT3 Tactical -Tungsten (44)
- AT3 Tactical - Gray (43)
- AT3 Tactical - Blue (24)
- AT3 Tactical - Red (24)
- AT3 Tactical - Stainless (8)
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AT3™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™RECOMMENDEDSt. Patty's Sale
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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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™St. Patty's 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... -
AT3™St. Patty's 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™RECOMMENDEDSt. Patty's Sale
AT3™ AR-15 3-Port Muzzle Brake with Crush Washer – 1/2×28 Thread for .223/5.56
Extreme Recoil Reduction at an Affordable Price Taming the recoil of 5.56 tends to be a pretty easy feat - but this muzzle device all but eliminates recoil with an... -
AT3™RECOMMENDEDSt. Patty's Sale
AT3™ AR-15 Enhanced Billet Trigger Guard Assembly
AT3 Billet Trigger Guard - Perfect for Winter and Gloves This billet aluminum trigger guard works with all mil-spec lower receivers, and makes additional room for manipulating the trigger. The...$9.99Only$8.49
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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