The FTN.5 seems to be the quietest can at the moment.

Short and lightweight will always mean louder, its just the tradeoff you have to make. Larger with more baffles tends to mean quieter with the tradeoff of size and weight. Although being 3D printed the weight isn’t anything like 17-4 stainless or inconel.

I’m working on a 22lr version of the B&T MP9 reduced back pressure can. It’s a flow through but massive for a 22lr so the increased volume should make it pretty quiet. But shes big. Unlike most print in place cans, this will need printed individually and assembled due to overhangs and support constraints. It’s direct thread for a 3/4x16 to 1/2x28 adapter. Still a work in progress though.