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In page M1 Garand:

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Also available was the M7 grenade launcher that could easily be attached to the end of the barrel.[1][2] It could be sighted using the M15 sight, which was attached with screws to the left side of the stock, just forward of the trigger. A cleaning tool, oiler and grease containers could be stored in two cylindrical compartments in the buttstock for use in the field.