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ST916556B , the more expensive version, is made of light materails, meaning the gun is lighter. A little over half pound difference.

The ST916556BLC model has a 10 shot magazine. The ST916556B has a 30 round magazine. The both weigh the same and are exact besides the magazine provided. One has is 6 pounds 11 ounces and the other 6.69 pounds, which is the decimal equivalent.

I would go with the cheaper one and buy whatever mag I wanted (because that is the difference)