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 – 7 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...7 Options -
AT3™
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™
AT3™ Mil Spec End Plate for AR-15 – 7 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...7 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™ 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 – AR-15
This 6-Position AR-15 Mil-Spec buffer tube is perfect for your next AR-15 build, or as an upgrade on existing commercial-spec tube. Made 6061-T6 aluminum construction with a black anodized finish,...7 Options -
AT3™
AT3™ Mil Spec Buffer Tube Kit For AR-15 – 7 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...7 Options -
New
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 -
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... -
New
Sylvan Arms AR-15 QD End Plate for Folding Stock Adapter – ARQD200
Durable QD End-Plate Designed For Folding Stock AR Builds The Sylvan Arms QD Tubelock is a replacement for the standard lower receiver end plate designed specifically with Sylvan folding stock... -
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 -
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... -
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. ...5 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 -
Armaspec A1/A2 Buffer Adapter for Stealth Recoil Spring
A Simple Drop-In Solution for using the Stealth Recoil Spring in a Fixed Stock If you have a fixed stock and rifle-length buffer assembly, you're probably short on options for... -
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 -
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... -
Fortis K2 Enhanced End Plate with Locking Lever and Castle Nut
Ratcheting AR-15 Endplate and Castle Nut The K2 castle nut and endplate from Fortis features a locking lever to ensure your buffer tube never backs out, without need for staking...6 Options -
Strike Industries Enhanced AR15 Castle Nut with QD Sling Swivel
Innovative Castle-Nut & QD End-Plate Combo from Strike The Strike Industries Enhanced Castle Nut and Extended End-plate combo is an innovative replacement part that will significantly improve both aesthetics and...2 Options -
Strike Industries Advanced AR 15 Receiver Tube
7 Position AR-15 Buffer Tube with Unique Facets The AR-15 buffer tube often gets neglected when considering builds or upgrades. That's because most are the same! Not so with the...2 Options
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
