If you mean the upper handguard, which contains the gas piston- make certain that the rifle is not loaded, and on SAFE. At the rear of the handguard is a small lever on the right side. Raise the lever 90 degrees. Lift the rear of the handguard as far as it will go, then swing the lever down- it should pass UNDER the end of the raised handguard. Lift the rear until clear, and then slide the handguard to the rear. surplusrifle.com contains good information on the SKS, and dozens of other milsurp firearms.
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