I wanna get the card for doing the challenge, as I have most of them already for most of the attachment challenges. But since rapid fire seems to be either useless or just plain sucks, I don't know what to use it on that won't be frustrating because I want to get it as fast as possible with the least amount of hassle.
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Most LMGs, actually, already have the range and low recoil to get some benefit out of RF. Since RF in BOII is essentially a trade-off of range for fire rate (and some added recoil just for kicks), LMGs benefit the most while SMGs benefit the least. Bit of a change-up since RF has traditionally been an SMG attachment but whatever.
SMG-wise the PDW is really the only one that isn't outright downgraded by RF.
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