Q&A for Vltor REA5 A5 Receiver Extension RE-A5 M4 Aluminum Black

Vltor REA5 A5 Receiver Extension RE-A5 M4 Aluminum Black

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Eric Davis Eric Davis, member, from TX, United States, asked on December 25, 2025

I have a carbine length armaspec sound mitigation buffer system on my 308, will I need a ¾ spacer?

Answered by VLTOR, guest, from AZ, United States, on January 14, 2026

Unfortunately we have not tested this combination with our RE-A5 Buffer tube.

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Matt, member, from OK, United States, asked on October 23, 2025

Will this work with a Magpul PRS Lite Rifle Stock paired with a KynSHOT AR-15 .223/5.56mm Buffer for Fixed Stock?

Answered by VLTOR, guest, from AZ, United States, on October 29, 2025

The RE-A5 will work with the PRS Lite stock, however we recommend only using our A5 Buffers with this tube for the AR-15 platform.

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Garazzo, member, from MI, United States, asked on September 09, 2025

Will a typical Magpul stock (CTR, MOE, etc) cover this when fully collapsed? Or is it too long to get that short of a LOP? Thank you,

Answered by VLTOR, guest, from AZ, United States, on September 10, 2025

The MOE-SL and STR will collapse fully on the RE-A5 tube. We don't have data on the other stocks.

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Ron, guest, from CO, United States, asked on March 17, 2024

Does this buffer tube come with castle nut ?

Answered by VLTOR, guest, from AZ, United States, on November 27, 2024

No, this is just the tube itself.

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Ernest, member, from NC, United States, asked on March 08, 2024

Can this buffer to be used with an AR 10 and if so, what buffer spring and buffer should I use?

Answered by VLTOR, guest, from AZ, United States, on November 27, 2024

The A5 Tube can be used on an AR-10 in conjunction with a standard AR-15 Buffer and Carbine Spring (Sprinco Red)

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JD, guest, from CA, United States, asked on August 03, 2022

will this work with a Geissele Super 42 rifle length spring?

Expert Answer

Answered by Ethan, Gear Expert, from IL, United States, on August 03, 2022

The Vltor REA5 A5 Receiver Extension will be compatible with the Super 42 Rifle length spring as long as you pair it with an A5 specific buffer.

6 of 7 found the following answer helpful.

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PMR, member, from FL, United States, asked on September 04, 2021

Will this work for a 14.5 mid length gas system?

Expert Answer

Answered by Ethan, Gear Expert, from IL, United States, on March 02, 2022

Yes. As long as you have a Mil-spec AR15 style lower receiver then the Vltor REA5 A5 Receiver Extension will fit. You can use any Mil-spec style buttstock with this extension tube.

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Nic, member, from SC, United States, asked on January 12, 2021

I'm replacing my buffer system in my DD 'mk18 which is better for that the Vltor RE-A5 or RE10-A5SR

Manufacturer Answer

Answered by VLTOR Weapon Systems, Manufacturer from AZ, United States, on July 08, 2022

Both the RE-A5 and RE-10/A5SR are the same overall length. The only difference is the the RE-A5 has seven position and the RE-10/A5SR has six. Due to the added length of the A5 system most mil-spec carbine stocks and braces will not fully collapse on the A5 Receiver Extensions. Depending on the carbine stock or brace that is used you will be able to use around 5 of the position on each A5 Receiver Extensions. If you wanted a stock that could use all position I do recommend the Vltor EMOD.

2 of 2 found the following answer helpful.

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CHRISTINA, guest, from TX, United States, asked on June 21, 2020

Is this a 7 position?

Expert Answer

Answered by Brandon B, Gear Expert, from IL, United States, on September 01, 2021

Yes it does have 7 positions.

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Patrick, guest, from AL, United States, asked on May 04, 2020

If I order the pistol kit, and also purchase the rifle receiver extension, is it possible to swap the A5 system between a rifle and braced pistol?

Manufacturer Answer

Answered by VLTOR Weapon Systems, Manufacturer from AZ, United States, on July 08, 2022

Yes, you can use the A5 buffer and rifle spring in all three of our A5 Receiver Extension (RE-PA5, RE-A5 and RE-10/A5SR). Although each build may call for different A5 buffer weight to get the best results. Please keep in mind you can not use the A5 Receiver Extension with a carbine buffer and spring it will cause damage to the firearm.

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Q&A for Vltor REA5 A5 Receiver Extension RE-A5 M4 Aluminum Black — 15 Questions & 15 Answers