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Old April 23, 2012, 11:47 PM   #15
Senior Member
Join Date: October 2, 2009
Posts: 103
I can't say what the Wilson (actually Scattergun Technologies) is made of, but I can say the spring is stiffer than stock, to help feed more reliably.
I believe Wilson uses Wolff springs which, IMO, are the best. The extension itself is steel.
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