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What is the outside diameter of this protector — 2 Answers

by D. Williams, from LA, United States Asked on June 3, 2018

Name GrovTec US Standard Thread Protector (4.3)
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Answered by Ethan C., Gear Expert, from IL, United States, on July 30, 2018

Diameter varies based on caliber, rifle, and barrel profile. Please contact us at techsales@opticsplanet.com with the exact model you are interested in, and we will be happy to assist you further.

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A
Answered by LD, member, from NY, United States, on March 03, 2021

The pencil barrel model has an outside diameter of 0.64 inches. So a 0.625" gas block won't fit over it without a whole lot of grinding and sanding. (This is mainly an issue for states that prohibit threaded barrels and muzzle devices, because you have to "permanently" attach your thread protector.)

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Last updated 2025-11-12 UTC.