1. Replace the piston back into the gas cylinder.

2. Slide the action spring over the action spring guide and insert the action spring/action spring guide assembly into the larger hole in the inertia block. NOTE: The rounded end of the action spring guide is inserted into the gas piston. The opposite end is flat, with a hole. This end fits to the receiver, with the roll pin passing through the hole in the action spring guide.

3. Position the action spring/guide/inertia block assembly underneath the barrel. Slide the rounded end of the action spring guide into the piston while compressing

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