Tube Brn AR-15 Rifle Receiver Extension
$49.18 at Brownells
In stock Sale
Best price
$65.99at Brownells
Out of stock checked Oct 31, 2026
In stock now instead
- Tube Brn AR-15 Rifle Receiver Extension $49.18at Brownells
- M4 Mil-Spec Buffer Tube Assembly $43.99at Brownells
- AR-15/M4 Receiver Extension $66.50at Brownells
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $65.99checked Oct 31, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar buffer parts in stock
This part is out of stock at every store we track. These similar buffer parts are in stock, with today's prices.
M4 Mil-Spec Buffer Tube Assembly
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Guntec USA AR-15 Mil-Spec Buffer Tube Set 6-position CAR Buffer/Spring/End Plate/Castle Nut Black
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Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $65.99 | $65.99 | $65.99 |
Since Sep 28, 2026.
About this part
The Mil-Spec Buffer Tube Assembly is an AR-15 buffer part from Brownells. One store lists it, Brownells at $65.99.
Specifications
- Manufacturer
- Brownells
- Type
- Buffer Tube
- Platform
- AR-15
From the manufacturer
Convenient kit contains all the components needed to mount the buttstock of your choice on an AR-15 rifle or carbine. Perfect for stock conversions such as altering a rifle to accept a collapsible carbine stock. All parts are manufactured from the highest quality materials and held to strict dimensional tolerances for proper fit and function. Commercial carbine kit comes with 1.168" O.D., six-position receiver extension for use with commercial or "universal" buttstocks. Mil-Spec kit has a 1.148" O.D., six-position receiver extension for correct fit of military M4 carbine buttstocks. M4 buttstocks and clones will not fit Commercial tubes. Mfg: Brownells SPECS: Receiver Extension & A2 Stock Spacer - Aluminum, anodized, matte black. Recoil Buffer - Aluminum and steel. Spring, Lock Ring, Receiver Plate - Steel. Kits fit standard, mil-spec AR-15/M16/M4 lower receiver and clones. Installation instructions included.
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