6.01 510mm RATech inner...
basically your choices are
6.01 380mm RATech
6.01 510mm RATech
6.01 510mm Falcon
if you are getting a 510mm then I personally like the RATech BUT the falcon inner barrel is just as nice and if you get the Kit then you get the Falcon Hopup Rubber + 510mm 6.01 and the barrel extension (which you will want) as a kit for like $80.00
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