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In addition to Patrick's question already asked, what is the inner diameter (for a recessed blast shield, suppressor, or linear comp)? — 2 Answers

by DangerMouse, from NC, United States Asked on September 7, 2020

Name Fostech MACH-2 AR-15 Tactical Rail (4.3)
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Answered by Ethan, Gear Expert, from IL, United States, on July 07, 2022

FosTech Outdoors does not provide the internal diameter of their MACH-2 AR-15 Tactical Rails. I'd recommend reaching out to them directly for more information. Their contact info is linked below:
https://fostech.com/about-fostech-inc/

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Answered by eraid0, member, from OH, United States, on November 04, 2022

I contacted Fostech and this was the answer I was given. "The inside diameter of the MACH-2 rail is 1 3/8"

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Last updated 2025-11-12 UTC.