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This Golden Eagle GBBR Basic Short Stroke Kit is designed to speed up the firing cycle of your M4. It doesn't provide any extra Muzzle Velocity, it provides a snappier response and reduces the firing cycle so you can get more shots off quickly. This is constructed of alloy & nylon components.
* Note: this GBBR Short Stroke Kit is only suitable for full-size GE GBBR M4 Buffer Tubes. This is not compatible with GE M4 Model MC65923M which has a Short PDW Buffer Tube