if you want your question to be answered by spyder people, then delete this thread and make it in the kingman spyder section which is under the Stack Tube Blowback section.
instead of spending the money to upgrade a Shutter, save the money and put ti toward a new gun.
Peter
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You can fool some of the people all of the time, and all of the people some of the time, but you can not fool all of the people all of the time. Abraham Lincoln