In this article by Jag Precision, Tang shows you how to do a quick spring change and select which springs that you can use for the Modify XTC-G1 AEG... "The great feature of the Modify XTC rifle is the true quick spring change system that can allow the user to easily install a new spring for a higher or lower FPS depending on what the field limit is. This process is made very easy since the wires are not in the buffer tube."
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