What 9mm design out there is the best for sound suppression especially with 147gr subs. This would be for use on a CZ scorpion
The FTN.5 PCC Flow has excellent sound reduction and reduced backpressure vs. the standard version. Simple blowback 9mm PCCs are noticeably more pleasant to shoot with a low-backpressure can.
If you want a quiet non-reinforced (fully printed) design, the Project 27 Mashina from OKB 69 is quite good, but it’s a bit of a beast from a size/weight perspective (1 lb and 10 inches long). It’s also a traditional non-flow design so you’ll get more gas to the face, a more felt recoil, and the action will get really dirty. If you go that route, use the 3/4x16 threaded blast chamber with a metal thread adapter since the 1/2x28 printed threads just don’t hold up – especially on a can that massive.
Be aware that even with the best commercial suppressor the gun will never be super quiet. Simple blowback actions “leak” a lot of sound when the bolt opens. Delayed blowback designs like the MP5 and Kuna make better suppressor hosts.
I am sorry and I hate to say this about someone else’s designs, but me and a few others on here have tried OKB 69 designs and none of them last or sounds great at all. I’m not trying to dog him, I’m just putting it out there before someone goes and wastes a stamp only to be disappointed. If you’re going to file the paperwork for one at least do a reinforced one.
For rifle calibers, I’d agree completely. But for a 9mm PCC, the bar is a lot lower. I wouldn’t unconditionally recommend all the OKB 69 designs, but I’ve heard the Pr. 27 and with 9mm subs I thought it sounded good. Is the FTN better? Absolutely. That’s why it was at the top of my list. But for some people, the ease of a non-reinforced design might be worth the trade-offs. If tax stamps were still $200, it would be a different story.
