Help: Scar 17s Gas Jet Tuning

[SkyScrapin]

I purchased a Scar 17s 16.1" barreled rifle from another hide member some months back. It has a Dead Air Sandman installed, and as you can imagine, it's over pressure. What have you done to tune over gassing and the interesting recoil impulse using gas jets or other methods?

Anyone have a similar configuration who has tuned the gas beyond what's offered with the factory config?

 

[smithjd]

I noticed my 17 was over gassed when accidentally leaving the gas regulator in the suppressor setting (all factory original) and gun ran fine. After mounting a suppressor (still 16” barrel), I bought a 1.40 (I believe factory OEM is 1.50) gas jet screw from Midwest Gun Works and installing it. It might still be a little over gassed, but I notice that the bolt ‘seems’ a little slower and it still runs boringly reliably in either setting, can or no can.

 

[SkyScrapin]

I noticed my 17 was over gassed when accidentally leaving the gas regulator in the suppressor setting (all factory original) and gun ran fine. After mounting a suppressor (still 16” barrel), I bought a 1.40 (I believe factory OEM is 1.50) gas jet screw from Midwest Gun Works and installing it. It might still be a little over gassed, but I notice that the bolt ‘seems’ a little slower and it still runs boringly reliably in either setting, can or no can.

@smithjd Good to know. I'm going to try the 1.3 and 1.35 custom jets just in case.

 

[Flip#1]

Please update on the 1.35 jet I purchased 1.30 too but I haven’t had a chance to shoot.

 

[SkyScrapin]

Please update on the 1.35 jet I purchased 1.30 too but I haven’t had a chance to shoot.

I’m going to shoot some next weekend. Have you been able to shoot with the 1.30 jet yet? @Flip#1

 

[Flip#1]

I’m going to shoot some next weekend. Have you been able to shoot with the 1.30 jet yet? @Flip#1

Hey everyone I want you all to know that the scar 17 performed well with 1.35 jet on a 13.5 inch barrel with 150gr all the way up to 175 gr from Winchester ammo to lake city all good to go.

 

[Flip#1]

So I am re doing the test after I tested last time the jet that was supposed to be a 1.35mm was not. when i mesure it it was not 1.35mm it was 1.65. be careful when buying this gas jets some vendors are full of caca. this are all OEM jets I will re test and report how low can you go and still run the gun.

 

[rr4406pak]

Any update on this?

 

[Flip#1]

1.20mm was the best and 1.30 lower than that it works but the rate of fire was way to slow for my liking