Because firefly doesn't make them fast enough to have stock oin north america
Like I said, HIGHLY SOUGHT AFTER, they're really high performance rubbers
However, I just put a falcon hop rubber in my 249, since all I could get my hands on was a falcon 6.03 barrel for coldfront (and the barrel comes with a rubber). Just took it out last night and put 600 rounds through it, it's pretty damn good.
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