The CF-W bolt for the M11/9 submachine gun, made from a tungsten alloy, significantly reduces the rate of fire from 1400 RPM to 550-750 RPM due to its increased weight (32.25 oz vs 15 oz OEM). This modification enhances controllability, allowing for easier single shots and tighter groups during full-auto fire, while also reducing perceived recoil and potential receiver damage. The design allows for open or closed bolt firing and features a 'paperclip mod' for easy spring adjustments.
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