Nine Ball Spring Upgrade - TM MP7A1
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July 11th, 2006, 12:23
Join Date: Sep 2003
interesting, I'll need to compare one of those Guarder chrony's to a shooting chrony when i get a chance. my mp7 was shooting 250-255 stock and 269-275 with a 6.03 tightbore. I wonder how much more I can squeeze with that spring.
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