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Old October 17th, 2011, 16:57   #1309
ILLusion
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Join Date: Jun 2002
Location: Toronto
The ProG4 trigger stirrup is a bit thicker & longer than stock, especially at the bend inside the front of the grip (the ProG4 version is a bit more square.)

I have a feeling you're not getting enough clearance for the disconnector to release the trigger.
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