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Admittedly I'm a little new to this but seems that the MCTAR-20XG2 won't fit on a standard Ruger 556? The threaded portion of the barrel nut is in way — 2 Answers

by ChickenWings, from NH, United States Asked on January 20, 2022

Name Midwest Industries Gen2 Two-Piece Free Float Handguard (4.6)
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A
Answered by Midwest Industries, Manufacturer from WI, United States, on February 03, 2022

That is correct. the MCTAR-20XG2 requires a mil-spec Gi barrel nut. the ruger 556 uses a proprietary barrel which is not a GI barrel nut. you would need to replace the ruger nut with a gi barrel nut. https://www.opticsplanet.com/aero-precision-ar15-standard-barrel-nut.html

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Answered by Joshua, member, from VA, United States, on January 04, 2023

You're gonna need a mil-spec barrel nut. Warning though, removing the barrel nut on an AR556 is an absolute nightmare! Took me and 2 other guys with a breaker bar to get one off!

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Last updated 2025-11-12 UTC.