are they really needed? wouldn't a mag that you don't care for work just as well?
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You need it for the barrel nut. Maybe the flash hider, depends on how tight its torqued.Is one needed just to change the flashhider?
Thanks Chris I knew you did I just had seen them on PSA and it got me wondering.....btw I'm still looking forward to getting that can on its what reminded me to ask this question.i have one if you need to borrow it.