Tough question. In my own use, yes, a Turbo K is generally enough on a 12.5”. As Clint says, thats the magic of a 12.5”. Would a full Turbo be quieter? Or quieter on a 11.5”, even? Yeah, absolutely. But a 12.5” is the sweet spot thats long enough that short cans do well, and also don’t get eroded as badly, or give up too much ballistically. Its also just short enough that your gun doesn’t turn into a polearm with a can. I tend to use a inch longer can on my ~11.5” guns, and am stuck with a inch shorter handguard. The Turbo K really shines on “longer” SBRs.
TL;DR: yeah, I recommend the Turbo K, and its one of my most used cans on a 12.5”, along with the MG7k I use at night.
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