Sig SRD45?

[Elkins45]

A shop I frequent has a Sig SRD45 for $519, including a piston for 45. I think that’s a pretty good price.

I would need to add a piston for 9mm and a fixed mount for 5/8x24 so I could shoot subsonic Blackout. Any better options?

 

[ogree]

The Rugged Obsidian .45 is more effective at sound suppression than the Sig SRD45.
The Obsidian is currently $654 from silencer shop and worth every penny.
I have shot both side by side and would not buy a Sig can, the M baffles in the Sig just don't work as well.

 

[MachIVshooter]

I have no personal experience with the SRD45, but it's one of the few pistol cans other than my Phoenix M-HD which uses a Ti tube and stainless baffles, so that's appealing. It makes a big difference; my Phoenix has taken full power .308 full auto from a 13" barrel and held together. That won't happen with the aluminum tubes found on most pistol cans.

However, since ogree has shot it, I'll defer to his opinion on suppression. The Obsidian is a pretty quiet can, as is the AAC TiRant 45M, which is also modular

 

[GoingQuiet]

Decent price, not many places will sell that can for less than 6. Bear in mind that by the time you buy spare parts and tax stamp you're into it for a dime.