Just wanted to let you all know that i bought the 6 in of the PDI X AS barrel. The hop up rubber is still rubber. The "metal" hop up is just a piece of aluminum that goes over the fixed hop up rubber. It was a pain to get to work. It messed up my loading nozzle as it wouldnt feed right. All i had to do though was take out a oring that they tell you to put and it worked. However, im not sure how performance is as of yet, but at least its shooting and not double feeding.
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