AR-15 Pistol Buffer Tubes: Micro or Standard?

The AR-15 platform is well-known for its modularity, allowing gun enthusiasts and builders to customize their firearms to specific needs and preferences. One area of customization that has gained attention in recent years is the buffer tube used on AR-15 pistols. Typically, there are two main choices in this arena: the micro and the standard pistol buffer tubes. In this article, we will explore the differences between the two, their pros and cons, and how to decide which is right for you.

1. What is a Buffer Tube?

Before diving into the specifics of micro and standard buffer tubes, it’s essential to understand the role of the buffer tube in the AR-15 system. The buffer tube, also known as the receiver extension, houses the buffer and buffer spring. These components manage the recoil and cycling of the firearm. In AR-15 pistols, the buffer tube extends rearward from the lower receiver but does not allow for the attachment of traditional rifle stocks.

2. Micro Buffer Tubes


  • Compact Size: As the name implies, micro buffer tubes are shorter than their standard counterparts. This results in a more compact AR pistol, easier to maneuver and store.
  • Weight: Generally, they’re lighter than standard tubes, making the overall firearm lighter.


  • Compatibility: Not all buffer weights and springs are compatible with micro tubes. This can limit customization options.
  • Durability: Due to their size, they might not be as durable as standard tubes under heavy use.

3. Standard Pistol Buffer Tubes


  • Compatibility: They’re designed to be compatible with a wider range of buffers and springs, offering more customization options.
  • Durability: Typically, standard buffer tubes offer more durability and can handle more extensive use and more substantial recoiling calibers.
  • Versatility: Some standard pistol buffer tubes come with features allowing the attachment of arm braces, enhancing the pistol’s stability.


  • Size: They are longer than micro buffer tubes, making the overall firearm a bit bulkier.
  • Weight: Generally, they’re heavier than micro tubes, adding a bit more weight to the overall firearm.

4. Which One is Right for You?

The choice between a micro and standard pistol buffer tube depends largely on your needs and preferences:

  • Purpose: If you’re building a compact AR-15 pistol for close-quarters use or easy transport, a micro buffer tube might be ideal. However, if you’re looking for more versatility and durability, especially if you plan to shoot more substantial recoiling calibers or put the firearm through heavy use, a standard tube might be a better choice.
  • Customization: If you have specific buffer weights and springs in mind or plan to use an arm brace, a standard buffer tube provides more compatibility options.
  • Weight: For those sensitive to the weight of their firearm, the difference in weight between the two types can be a deciding factor.


Both micro and standard AR-15 pistol buffer tubes have their advantages and limitations. By understanding these and assessing your specific needs and preferences, you can make an informed decision about which one is right for your AR-15 pistol build. Remember, the AR platform’s beauty lies in its modularity, so choose the components that align best with your goals and enjoy the customization process.

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