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Old November 4th, 2011, 13:31   #12
GBB Whisperer
ILLusion's Avatar
Join Date: Jun 2002
Location: Toronto
Good to know. I haven't seen any of their modern hop ups lately. Unfortunately, they use a really crap rubber in most of their GBB's that's prone to swelling when exposed to any moderate amount of silicone oil.

The PDI rubber is made of Nitrile, which is a very resilient compound against many chemicals, while being able to maintain high flexibility (unlike Viton).
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