I say .28's but it's up to you to experiment, some play with .30 but I feel it's a bit too slow for me. .28 is a good intermediate beween the speed/relative accuracy of .25's and the relatively lower speed/higher accuracy of the .30.
So if it's GBBR then just get NPAS first but when parts tart to break from wear/tear or whatever then upgrade to RA-Tech parts (or whatever the cool kids are using these days, I don't really keep up with GBBR's too much TBH).
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ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE
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