Vltor A5 Receiver Extension (RE-A5)

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Vltor Modular Upper Receiver

The RE-A5 Receiver Extension is a seven position receiver extension designed to work with the VLTOR A5 system. This receiver extension is slightly longer than the traditional M4 receiver extension and is designed to work with Mil-Spec dimensioned M4/AR-15 type collapsible stocks.


  • Seven position receiver extension made from impact extruded 7075 T6 aluminum
  • Hard coat anodized
  • Positions are numbered and are visible through the witness hole on most stocks
  • Snag-free sliding of the buttstock


  • Receiver is designed to use the VLTOR A5 spring and buffer kit only which is sold separately.
  • Receiver extension is Mil-Spec dimensioned and will only accept M4 type Mil-Spec buttstocks
  • Space between the seven positions of the receiver extension: 0.650”

1. Can I use a carbine spring and buffer kit with the RE-A5?
You cannot. The use of a carbine spring and buffer with the RE-A5 receiver extension could result in damage to your firearm. The RE-A5 receiver extension is designed to only work with other VLTOR A5 components which can be purchased separately.

2. What stock can I use with this receiver extension?
The A5 receiver extension will accept most M4/AR-15 type stocks. You would need to make sure that it is a Mil-Spec dimensioned stock. Please take note, most AR-15 type stocks will not collapse all the way down to the last position due to the A5 receiver extension being longer than a traditional M4 receiver extension. The VLTOR EMOD stock will collapse all the way to the last position with the RE-A5 receiver extension. If you do want to use a different stock or the VLTOR IMOD stock with the A5 components and have your stock collapse all the way down, we do sell a different A5 extension that will allow this. It is the VLTOR RE-10/A5SR. It is a six position Mil-Spec A5 receiver extension. This receiver extension is slightly shorter to allow for the stock to collapse all the way down. You must use the A5 spring and buffer kit for this receiver extension.

3. What is the overall length of the RE-A5?
Overall physical length is 7 15/16″


  • 5
    Great tube

    Posted by Average Joe on 21st Sep 2022

    I've used A5's in several builds. It is a great design. Can't beat it paired with a Sprinco green spring. Tube itself is great quality and they hold high standards to their specs.