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by Jay, from PA, United States Asked on May 9, 2018
For .308 versions specifically, the threaded versions has threaded holes on the sides to attach their Pic rails to. The non-threaded handguard has M-Lok slots.
The threaded version (308L) is also meant for low-profile 308 uppers. The M-Lok version (308H) is meant for high-profile 308 uppers.