M4 Mil-Spec Buffer Tube Assembly

Name: M4 Mil-Spec Buffer Tube Assembly
Brand: Brownells
Availability: InStock

Brownells · Buffer Tubes & Springs

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Best price

$43.99at Brownells

In stock Sale checked Oct 21, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$43.99Salechecked Oct 21, 2026	In stock	Buy at Brownells

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Price history

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Lowest in-stock price in the last 30 days: $43.99 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

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Store	Latest	Lowest	Highest
Brownells	$43.99	$43.99	$43.99

Since Sep 27, 2026.

About this part

The M4 Mil-Spec Buffer Tube Assembly is an AR-15 buffer part from Brownells. One store lists it, Brownells at $43.99. The lowest in-stock price in the last 30 days was $43.99 at Brownells.

Specifications

Manufacturer: Brownells
Type: Buffer Tube
Platform: AR-15
Material: Aluminum

From the manufacturer

Features: Six position AR-15/M16/M4 receiver extension assembly Includes Mil-Spec receiver extension/buffer tube, receiver lock plate, lock-nut/castle nut, carbine buffer and carbine buffer spring Buffer tube is Mil-Spec diameter and 6061 aluminum Carbine buffer weight is 3 oz Buffer spring is 17-7 stainless steel Mfg: Brownells Fits standard AR-15/M16 lower receivers. Mil-spec diameter. Includes buffer tube, lock plate, castle nut, buffer and buffer spring.