What is the difference between the SCAR25 models?

The SCAR25 is made of 7075 T6 Billet Aluminum, and the SCAR25 MOD 2 is made of AZ31 Billet Magnesium. The result is a 30% weight savings, and 40% less heat transfer during sustained fire. The SCAR25m has the same properties as the SCAR25 MOD 2 however it will only fit on the military MK17 rifle only. There are a number of differences that only pertain to the military select fire MK17 rifles that will prevent it from fitting on a semi-automatic SCAR.

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