Scar 20s 6.5 gas jet size for suppressed use

[SoundFx]

Hi All,

Got a 20s inbound and wanted to see if anybody has a suggestion on gas jet sizes for running suppressed. I’ll probably end up with a Nomad or Vox-S on the gun, so not exactly a low back pressure can. PMM said they didn’t have data on the 6.5 barrels yet so they couldn’t give me much to go on (not their fault).
Has anyone already done this and found a good solution? Many thanks in advance.
-Sfx

 

[TangoSierra916]

have you watched PMM youtube videos? They don't talk 6.5, but do discuss the 17 and 20 with 7.62, may be a starting point for you as they discuss the testing process for the "right" jet.

 

[DJ 480]

Don't hesitate to call PMM, they will be willing to talk specifics about your setup and recommend a good jet size. Buy a couple above and below in size as well to help the tune process.

 

[SoundFx]

Thanks for the replies, Gents. On Friday I just bit the bullet and bought all the sizes from 1.20 to 1.40. When I get everything together I’ll figure it out going from small to large. Just didn’t know if someone had the info on hand. PMM did not want to recommend anything without having a 6.5 themselves, I guess. Their reply was short and clear, which is fine.

I post an update if I get some data. Don’t have a pin gauge set but I can do some informal tests with drill bits or something.
Many thanks,
Sfx