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will a 18650 battery fit? they are the same length as two cr123s but slightly larger diameter. — 2 Answers

by D, from FL, United States Asked on February 1, 2023

Name Magpul Industries STR Mil-Spec Carbine Stock (4.7)
$84.95 $77.95 Save $7.00
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Answered by Ethan, Gear Expert, from IL, United States, on October 25, 2023

Magpul states their STR Mil-Spec Carbine Stock will accommodate up to two (2) CR123A lithium or AA batteries. I would recommend contacting Magpul directly regarding compatibility with other batteries.

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Answered by ChrisF, member, from OH, United States, on January 07, 2026

18650's will not fit in the STR. Just tried it in mine.

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Last updated 2026-01-07 UTC.