How many times have you grabbed a new gun and got rid of the old just to find out that you hate, say the rate of fire? Maybe you want to change from a auto rifle to a pulse but you don't want to field test it? A shooting range can change that all, maybe even add in an option to test out a gun before you buy? Hmm interesting concept isn't it?
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Or at the very least give a reasonable time frame for a full refund of marks. That's a week and a halfs worth of marks farming for something you're unsure of, and permanent.