Timo Posted May 27, 2016 Share Posted May 27, 2016 Just received a Nuprol Bocca suppressor through the post and was wondering if anyone knows what is the function of the spring which runs the length of the barrel? Link to comment Share on other sites More sharing options...
Supporters jcheeseright Posted May 27, 2016 Supporters Share Posted May 27, 2016 keeps the foam in place. Link to comment Share on other sites More sharing options...
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