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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.
Prices checked
Brownells AR-15/M16 Mil-Spec Buffer Tube 6 Position ranked #22 of the 40 buffer tubes builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #26 of the 71 buffer tubes builders have added. Builds with this buffer tube are mostly chambered in 5.56 NATO (75%, then .223 Wylde 10%), split between carbine-length (33%) and mid-length (28%) gas systems, and nearly all AR-15.
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 37 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 | $1885.31 |
 | 24 | $1735.69 |
 | 16 | $606.78 |
 | 21 | $807.51 |
 | 20 | $3306.65 |
1 global rating
Top reviews
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.
