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Brownells
Overview
The Brownells AR-15/M16 Mil-Spec Buffer Tube is designed as a carbine buffer tube that allows for the installation of six different stock positions, providing flexibility in length of pull for the shooter. Built to Mil-Spec standards, it ensures compatibility with a wide range of stocks and components, making it a reliable choice for your build. This buffer tube commonly appears in mid-length gas system builds chambered in 5.56 NATO, offering a balanced setup for various shooting scenarios.
Brownells AR-15/M16 Mil-Spec Buffer Tube 6 Position ranked #24 of the 48 buffer tubes builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since January 2026. All time, it ranks #26 of the 63 buffer tubes builders have added. Builds with this buffer tube are nearly all chambered in 5.56 NATO, split between carbine-length (50%) and mid-length (50%) gas systems, and mostly AR-15 (67%, then AR-10 33%).
Today the one retailer we track has it in stock. Buying today, the lowest price is $23.66 at Brownells.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every buffer tube by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Buffer Tube Guide →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Brownells Ar-15/m16 Mil-Spec Buffer Tube 6 Position
| Build | Parts | Total |
|---|---|---|
 | 26 | $1826.83 |
 | 24 | $1758.24 |
 | 16 | $658.67 |
 | 21 | $801.17 |
 | 20 | $3297.91 |
2 global ratings
Top reviews
Brownells mil-spec 6 position buffer tube has a comfortable cheek weld for extended range sessions. The QD socket holds a sling without play. Threads to a standard milspec castle nut. Anodize is the standard matte black. Budget tube that works.
Plain milspec buffer tube from Brownells, does the job for a budget build. Threads were clean and lined up with my castle nut without any binding. Six positions click positively. The integrated QD point is only on the left side which is fine if youre left hand carry but odd for right handed.
