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Standard GBB fires roughly 230-250 FPS on Duster with .2g bb's at room temperature.
Standard GBB fires roughly 300-350 FPS on Propane with .2 bb's at room temperature
Stock TM AEG fires roughly 250-300 FPS stock with .2g bb's at any temperature.
Now.. My Mk. 1 Carbine fires anywhere between 135 and 550. Sure, it's an NBB, but you can discern that there is no set answer. It can vary depending on temperature, ammount of gas in the magazine, what gas you're using and of course upgrades.
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