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Is the barrel extension for a 6.5 Grendel barrel just a standard AR barrel extension, or is there a special Grendel barrel extension?
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It is usually an M4 barrel extension with the extended feed ramps, and needs to be of quality manufacture. The reason is that certain extensions are heat-treated after the ramps are broached, and they warp ever so slightly, which doesn't matter on a 5.56 or .204 Ruger gun. On the Grendel, the larger case diameter and the extractor travel over the rim need the clearance that a concentric extension provides, otherwise you can experience a really weird Failure To Feed with the cartridge halfway in the chamber.
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