AR 15 Buffer Tube Parts (Receiver Extension)
Various sets and individual items that make up the receiver extension are all here on AT3.
The buffer tube, spring, buffer, castle nut, and the locking ring are all available for the milspec or the commercial variants. READ MORE
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AT3™
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™
AT3™ Mil Spec End Plate for AR-15 – 10 Colors Available
Mil-Spec Steel Endplate for AR15 Lower Receivers This standard endplate is compatible with any mil-spec AR15 lower receiver. Perfect for completing a build that might be missing this component, or...10 Options -
Armaspec Stealth AR 15 Recoil Spring (Armaspec SRS) | Multiple Buffer Weights
Reduce Recoil, Wear, and Unwanted Rattling Armaspec's Stealth Recoil Spring™ is one of the best upgrades for your AR15's recoil system, and you can feel and hear the difference instantly. ...7 Options -
AT3™
AT3™ Mil Spec AR-15 Buffer Tube – 10 Colors Available
Mil-Spec AR-15 Carbine Buffer Tube Made 6061-T6 aluminum construction with a black anodized finish, with six precision-machined notches to securely lock your stock into position. This buffer tube has a...10 Options -
New
Luth-AR .308 Rifle Buffer Spring for AR-10/LR308
Luth-AR Rifle Buffer Spring for AR-10/LR308 The Luth-AR Rifle Buffer Spring for AR-10 style rifles fits perfectly into A1/A2 style buffer tubes. Featuring tempered spring steel construction for longevity, this... -
New
Luth-AR AR-15 Carbine Buffer Spring
Luth-AR Carbine Buffer Spring for AR-15 This AR-15 buffer spring from Luth-AR is a perfect replacement for a worn-out recoil spring in a well-used rifle. This spring drops into standard... -
AT3™
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™
AT3™ Mil Spec Buffer Tube Kit For AR-15 – 10 Colors Available
The perfect kit for your next build - at a price that can't be beat. This Mil-Spec AR-15 Buffer Tube Kit includes the buffer tube, castle nut, lock plate, 3oz...10 Options -
AT3™
AT3™ Carbine Buffer (3.0 oz) for AR-15
Standard Carbine Buffer Weight for AR15 This one-piece carbine buffer weight with rubber head weighs in at 3.0 oz, standard weight for AR15 buffers. This is typically the ideal weight... -
Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 – Multiple Buffer Weights Available
Improved & Easy-To-Install Captive Buffer Weights For AR Builds The Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 is a quick and easy replacement for your standard buffer and spring....6 Options -
AT3™
AT3 Tactical AR-15 Heavy Buffers – H1, H2, and H3 Buffers
Tune Your Overgassed AR-15 with Recoil-Reducing Heavy Buffers If your rifle is throwing brass forward and recoiling sharply, you've likely got too much gas in your recoil system. Most commercially...3 Options -
Timber Creek Outdoors Mil-Spec AR 15 Buffer Tube
7075 Aluminum Buffer Tubes Finished in Durable Cerakote Timber Creek Outdoors shows us once again what you get when you combine great US-made components with a visual pop that lasts. ...7 Options -
UTG Pro Mil-Spec AR 15 Buffer Tube 6-Position Receiver Extension
Superior Quality Mil-Spec Buffer Tube - Unbeatable Value The UTG Pro 6-position Mil-Spec receiver extension is precision machined from 6061 T6 aluminum forgings to true Mil-Spec dimensions. Provides a solid...5 Options -
Sylvan Arms AR-15/AR-9 Folding Stock Adapter Gen 3 – ARH300
An Innovative Tool To Transform Your AR-15/AR-9 Into A Folding Rifle The Sylvan Arms AR-15/AR-9 Folding Stock Adapter Gen 3 - ARH300 is an innovative accessory that will allow shooters... -
UTG Pro Six Position Mil-spec AR 15 Buffer Tube Kit
Complete UTG Buffer Assembly - Add Your Own Stock This receiver extension kit from UTG comes with a buffer tube, buffer spring, 3.0 oz carbine buffer, castle nut, and endplate. ...2 Options -
Odin Works Adjustable AR-15 Buffer Weight – Heavy
Heavy Steel Buffer for Overgassed or Blowback AR15 In the world of AR15s, you may have a specialized firearm that requires a specifically tuned gas system. Especially for rifles that... -
Aero Precision Enhanced AR-15 Carbine Buffer Kit
Enhanced Buffer Tube Kit for Easy Assembly and More Aero Precision's enhanced buffer tube offers numerous upgrades over standard mil-spec style kits. For starters, the buffer tube makes assembling to... -
LBE Unlimited Ambidextrous End Plate
LBE Unlimited ARAMEPL AR 15 Ambidextrous End Plate Sling Loops Steel Phosphate FinishBlack -
AT3™
AT3 Tactical Flat Wire AR-15 Buffer Spring
Improve Your AR-15's Recoil with a Flat Wire Buffer Spring Made in the USA with cryo-treated 17-7 stainless steel, this flat wire recoil spring drops into your buffer tube to... -
Armaspec Buffer Weights for Stealth Recoil Spring
Modify your Stealth Recoil Spring with a Modular Weight Already invested in a Stealth Recoil Spring, but don't want to get a whole new assembly just to tune your AR just right? The...4 Options -
Fortis K1 Enhanced End Plate with Tapered Castle Nut for AR 15
Lightweight AR-15 Castle Nut and Endplate with Friction Fit Fortis created the two-piece K1 system to eliminate the risk of the castle nut backing out, while maintaining light weight. The...6 Options -
Luth-AR .308 Carbine Buffer Spring for AR-10/LR308 Rifles
.308 Buffer Spring for AR-10 Style Rifles An important thing to note when you're building an AR-10 is that your buffer spring is not interchangeable with an AR-15. .308 buffer... -
Law Tactical AR-15/AR-308 Folding Stock Adapter Gen 3-M
Keep it Short - The Adapter You Need For Folding AR-15/AR-10 Rifles The Law Tactical Folding Stock Adapter Gen 3-M is an innovative upgrade that will allow AR-15 and AR-10...2 Options -
Aero Precision Enhanced AR-10 Carbine Buffer Kit
AR-10 Enhanced Mil-Spec Buffer Tube Kit This enhanced buffer kit for AR-10 style rifles offer some great features over a standard carbine buffer kit. The enhanced buffer tube keeps things...
Other Lower Receiver Components for AR 15:
AR 15 Buffer Tube Parts (Receiver Extension)
AR-15 Triggers
Buttstocks
Lower Parts Kit for AR-15
Magazines & Parts
Pistol Grips
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