Upgrading A Classic Army M249

The C. A. MK249 is one solid piece of airsoft gun. For those of you that own one you know that this gun has a very high rate of fire out of the box. Put a Systema or other brand 120% spring in, do not worry about the stock gears they can take it. You will find your 249 will shoot around 380 fps. Only use 8.4 volt battery. With this one simple upgrade installed you will find your airsoft gun last longer and performs better on the field. For more tips and tricks visit my shop site located at www.airsoftgunrepair.com