So frustrated as I can't find anything online about this. I have an OEM P320 threaded barrel that has M13.5x1 threads per Inch. It definitely won't screw into my new OSS RAD 9 suppressor. So I am trying to find out what the thread pitch is for the OSS RAD-9 and more importantly, what I need to do to either the barrel or the can to mate them. Buying a new threaded barrel isn't an option due to recent laws in my state, WA.
ZoNoMo
OSS RAD-9 on Sig P320 OEM Barrell
All you need is a booster (LID / Nielsen Device) in 13.5x1. I have a whole collection of these for my Lunar-9 / GM-9
![Image]()
They make a M13.5x1LH piston. This is all you would need, swap it with the current one installed on your suppressor.
Huxwrx (OSS) RAD piston
Huxwrx (OSS) RAD piston
Thank you everyone. As a Silencer Newbie, I didn't understand there to be a European Standard and a Standard-standard. 
Once I got the right Spring Assembly, I was back in biz! The only PIA thing for me now is that my EPC 9 and my P320 have different springs. Augghh...
Once I got the right Spring Assembly, I was back in biz! The only PIA thing for me now is that my EPC 9 and my P320 have different springs. Augghh...
You’ll get use to it and be an expert in no time. Just remember to only use the booster assembly on barrels that move. If you use
It on a rifle or a pistol like a Beretta 92 or a Sig P322 you need to use a fixed barrel spacer and no springs.
It on a rifle or a pistol like a Beretta 92 or a Sig P322 you need to use a fixed barrel spacer and no springs.
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