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When using this in a Magpul UBR Gen 2 stock, will you need to use the buffer spacer provided by Magpul, or is it not necessary? — 2 Answers

by Ryan, from CO, United States Asked on January 21, 2018

Name Vltor SP-1 Carbine Spring and Buffer Kit (4.7)
$32.95 $29.66 Save 10%
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A
Answered by VLTOR Weapon Systems, Manufacturer from AZ, United States, on May 10, 2023

You will need to use the spacer as this is not our A5 system.

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A
Answered by CK, member, from NY, United States, on October 03, 2018

Yes, in this scenario you will need to use the spacer. If you want to get the benefit of UBR Gen2 longer receiver extension and negating the need for spacer use in the process, you’ll need to get the Vltor A5 buffer and spring, which bridges the reliability of a rifle length gas system and compactness of that of a carbine setup.

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Last updated 2025-11-12 UTC.