It is unsurprising to see firms experimenting with different configurations and business models.

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It is equipped with advanced electronic, electro-optic, infrared and laser system technologies, as well as secure radio systems with data links and munitions capacity for 130 different types of weapons configurations.

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Available in three different configurations, customers can choose a Mac mini with the latest dual-core Intel Core i5 or Intel Core i7 processors, AMD Radeon HD 6630M discrete graphics, or a quad-core Intel Core i7 powered server configuration.

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Computer makers, for example, often sell many different models, in countless configurations, in part so that it is hard to compare their machines with those of rivals.

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