I'm a big fan of Thunderbeast's 30P-1. It is a titanium can, very well made, quieter than a few others I've tried, and - on the few guns it has mounted to - shows very little if any change in impact at reasonable subsonic 300WTF ranges.
I also have a Yankee Hills Phantom in SS, it is heavy as balls and the baffle design has given me some fits in some subsonic rifles, but in super it has worked quite well for me.
In terms of QD vs. thread-on, I am a huge thread-on fan. Of all the QD mounts I've used, YHM is among the best, as it a more course threading of the can onto the QD adapter. Avoid Gemtech's QD. Surefire's is a good QD setup, but you'll pay a hefty price to get one.
Everyone will have an opinion, wade through them with caution. I advise you find a class 3 dealer near you and talk with them about what they carry and why.
(Sandstorm is also quite nice, just got one, light weight, seems a bit louder than the Thunderbeast, and took hella long time to get.)
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