Ya, that's kind of what I've seen to. And ya the jk has terrible reviews. Pretty much have to run it wet to get much. No thanks.
Have you shot any of the integrals on shotguns?
I have not. It's funny, I've never cared for the idea of integral silencers for the exact reason that I believe Kevin Brittingham and Q made a youtube video on. Mainly good subsonic ammo available so you don't have to castrate lighter loads with gas bleed-off to avoid the supersonic crack.
I could see it being somewhat relevant for some shotgun ammo, as most payloads are relatively high and hover right at or over the speed of sound, and therefore could benefit from a slight reduction in velocity with the added backpressure to still cycle semiautos. I would be interested to see some pattern testing and such for an integral, especially if you can swap chokes on the end.
I'm sure someone somewhere in a machine or welding shop has made a good shotgun silencer, but unfortunately our industry as a whole is rather lacking of good (and creative) engineers, and thus the major companies seem uninterested in throwing resources at the shotgun market.
I'm not going to claim I have a ton of experience with various silencers first-hand, but between Pew Science, Thunderbeast's Silencer Summit Results, and others, there's now a lot of apples-to-apples comparison data available to the buyer. From an engineering perspective, good proven designs are fairly easy to spot, and there are a few dead giveaways if a lack of thought or effort went into a model.
Example: If your mount and muzzle device combo weigh half a pound or more, and add over an inch of unnecessary length to the barrel, I don't trust that your engineers had the capability to design the actual silencer worth a **** either.