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Old January 25th, 2017, 23:16   #2
Red Dot
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Join Date: Dec 2013
Location: Stouffville, Ontario
I will say maybe the inner barrel / hop-up rubber. But don't start replacing things that you have no idea what it will do or compatibility, you'll create problems that way. Once things start to breakdown that's when it's a good time to think about aftermarket parts but it's not really necessary IMHO.
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