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... -
Armaspec Stealth 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 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 -
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™ 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
KE Arms 9mm Buffer Tube Kit – 5.5 oz Buffer Kit for Pistol Caliber...
Heavy 9mm Buffer Tube Kit for Pistol Caliber AR-15 When you're building a 9mm AR-15, it's best to go with components that will work well together in concert. For most... -
New
KE Arms Carbine Buffer Tube Kit – 3.0 oz Buffer Kit for 5.56 Rifles
American Made Buffer Tube Kit for 5.56 AR-15 For the best performance from your AR-15, quality components will take you a long way. This US made buffer kit from KE... -
Timber Creek Outdoors Mil-Spec 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 -
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... -
New
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 -
New
Strike Industries Advanced 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 -
LBE Unlimited Ambidextrous End Plate
LBE Unlimited ARAMEPL AR 15 Ambidextrous End Plate Sling Loops Steel Phosphate FinishBlack -
Door Buster!
UTG Pro Mil-Spec 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 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 -
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... -
LBE Unlimited AR-15 Castle Nut
Machined from 4140 steel with a manganese phosphate coating. Excellent replacement part or for any new build. Made In the USA -
Armaspec Replacement O-Rings for Stealth Recoil Spring – 3 Pack
Keep your Stealth Recoil Spring in Check with Replacement O-Rings The Armaspec Stealth Recoil Spring uses a rubber O-Ring to reduce metal-on-metal contact with the buffer weight and the rear face of... -
AT3™
AT3 Rifle Lower Build Kit – Magpul Stock and Grip, AT3 Lower Parts Kit...
Finish Off Your New Rifle Lower with an Enhanced Trigger and Matching Magpul Furniture Your AR lower has some of the most critical parts you don't want to skimp on...4 Options -
3 Pack of 1/4 Inch Spacers for Stealth Recoil Spring
Spacers for Fitting the Stealth Recoil Spring in Non-Standard Builds For builds with long, non-standard buffer tubes, these spacers can be useful for ensuring your Stealth Recoil Spring will function... -
DoubleStar AR-15 Ambidextrous Loop End Plate
Upgraded End Plate For Multiple Carrying Options The DoubleStar AR-15 Ambidextrous Loop End Plate is an upgrade on the standard AR-15 stock end-plate that offers right-hand, left-hand, or ambidextrous carry... -
LBE Unlimited Buffer Tube for AR-15 – MILBUFKT
The LBE Unlimited Mil-Spec Buffer Tube Kit for the AR15 comes with a buffer tube, castle nut, lock plate, recoil buffer and recoil spring. Get all the parts you need... -
Geissele Super 42 Braided Wire Buffer & Spring Combo, H1
Designed To Improve The Function & Reliability Of Your AR-15 The Geissele Super 42 Braided Wire Buffer & Spring Combo was designed to improve the function and reliability of your... -
LBE Unlimited Carbine Heavy Buffers – 3 Types Available
Weighted recoil buffers - use where extra weight is needed to ensure proper cycling. Weights are as follows: H1 3.8ozH2 4.6ozH3 5.4oz Made in the USA3 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
