The "snubby" suppressor is a little quieter, and has less long-range accuracy.
The long suppressor has the advantage of better accuracy. You'll notice that is why weapons that have these attached are still very accurate when fired on full-auto (i.e. F-90 / STG-77 / 552 / M-4 A1 / IW-80 / HK-36 / M-8 LAR).
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