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BrettB, what size gas block screw do you recommend starting with for a can? I use the SiCo Omega. Looks like there are 15-20 sizes from 1-2mm | |||
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| Go ahead punk, make my day |
I went from the 16" OEM length to 13" cutdown barrel and suppressor (AAC-762-SDN6). 1.40MM is what I finally settled on, working both suppressed and unsuppressed down to M80 FMJ type loads (non-Wolf or other stuff). | |||
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| Middle children of history  |
First I would buy this mini drill bit set for $5. With this you can accurately measure your current GCS size, and then measure the replacement sizes if they aren't labeled or if you mix them up sometime in the future. https://www.amazon.com/gp/prod...ilpage?ie=UTF8&psc=1 On a factory 17S 16" barrel your GCS is probably 1.5mm. I would buy a few incremental sizes down to 1.3mm to start with. Work your way down in sizes with 1 round in the mag ensuring the bolt locks open. When the rifle short strokes go up a size or two for margin. Do this unsuppressed first and then add the can and test it again. A lot of this depends on what ammo you shoot, and cold temps also affects things (shooting in very cold temps requires some additional margin on GCS size). Make sure you soak the GCS threads in the gas block with some PB Blaster before you try and remove it. It can get stuck if it's been in there for a while. | |||
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| Middle children of history |
Be sure and post some feedback when you get to shoot it! | |||
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| Member |
Thanks for the info Rhino and Brett, this gives me a good starting point. | |||
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| Member |
I have an OPS 12th in .30 for my 17. The two point mounting is a bit of a pain but it is a great can with a very pleasant tone. If I was buying today I'd likely look hard at the Sig cans based on price with their mil le program and reviews. Do you know some folks with cans? Id say go shoot a bit or even go to a silencer shoot if theres one near you. | |||
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| Go ahead punk, make my day |
And it's an easy process to do, just a little time consuming. Remove the regulator, remove / replace the GCS, install the regulator, shoot with different ammo in different configurations, suppressed and non. I started high (overgassed) to low. Eventually you still get function with milspec ammo but the powderpuff starts failing to lock back the rifle after the last round. Load 1 round in a magazine each time and it's easy to see. That's how I ended up on 1.40mm with my SBR'ed 17 for suppressed and non use. Hasn't given me a lick of trouble since that hour of work at the range several years ago. | |||
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| Go ahead punk, make my day |
I use the AAC Blackout FH Mount, it's been awhile so I don't recall if I got a specific mount - and Marvin Pitts of Nefarious Arms did my barrel cut down and mount installation. So sorry, no real help. | |||
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| Go ahead punk, make my day |
I'd reach out to Parker Mountain Machine or Marvin Pitts to see if they have recommendations. PMM might be better because they seem to be more responsive than the last time I corresponded with Marvin, but that may have improved IDK. | |||
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Member |
Getting in touch with PMM up in New Hampshire would be worthwhile. http://www.parkermountainmachi...0/SCAR_16%2F_17.html https://youtu.be/otiPvTUNPpM The guys at Q also have some interesting stuff. https://www.liveqordie.com/products/cherry-bomb-by-q/ "Freedom is a light for which many men have died in darkness." | |||
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| Member |
I like the design of the OSS HXQD 762. Seems to really help with back pressure. https://youtu.be/ZOisNmQUYuo https://youtu.be/MA2OO5yld28 "Freedom is a light for which many men have died in darkness." | |||
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Member |
They have a SCAR-specific muzzle device planned, I have no idea when. The standard Cherry Bomb needs a shoulder adapter. Per Q when I emailed asking about compatibility. I'll be getting my SCAR 17 setup once my Trash Panda gets out of jail. I'm holding off hoping their SCAR bomb comes out soon. I've also got a 8.3" 300 and a Q 16" 300 barrel to pair with the can. | |||
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| Member |
Q certainly have some interesting stuff in the pipeline. They are taking the managed growth path, smart, but frustrating if you want it now, say like a Honey Badger pistol and a Thunder Chicken. "Freedom is a light for which many men have died in darkness." | |||
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| Member |
Got some variable size GCS in today so I tried to take my stock one out. It looks like it has a flat head slot so I tried to remove it after soaking in some PB blaster. It ain’t coming out... the very small slot stripped as soon as I put pressure on it. any suggestions? Can’t get an easy out down in the whole. The guide hole above it is too small. I’m thinking I might have to send it off to a gunsmith. I checked the hole on my stock GCS and it’s 1.6. I used the mm drill bit set suggested above. Thoughts Brett and Rhino? | |||
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| Go ahead punk, make my day |
ETA - I was incorrect, OEM screws do have a slot for a flat head, several of the aftermarkets I sourced have a metric hex fitting. Both mine were removed by the gunsmith who chopped the barrel (Marvin Pitts), so I would assume you might need to do that or drill it out yourself. | |||
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| Member |
Thanks for checking. It didn’t look like it had a hex head but I couldn’t really tell. I’ll look into options of drilling it out. I really want to find the correct setting. I am pretty sure it’s over gased at 1.6 mm. Update** I got it out! I found an easy out set I had with left hand drill bits. I had to remove the front sight post to drill it out. Soaking over nite in PB Blaster probably helped too. Now time to hit the range with the different sizes and dial my Scar in.This message has been edited. Last edited by: D4Heavy, | |||
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| Member |
Using a Surefire Socom mini with mine and have had good results and no malfunctions | |||
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| certified biohazard |
the factory seem soft to me, if I still had my 17s I would use PMM. I settled on 1.4mm when I was running mine supressed with an Omega 300 "All that is necessary for the triumph of evil is for good men to do nothing" Edmund Burke | |||
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| Go ahead punk, make my day |
Great to hear you got it out. | |||
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| Member |
Just for clarification, when testing the various GCS do you check all 4 configurations i.e. Suppressor on and off, gas settting suppressed and Un-suppressed? Going to the range tomorrow and want to make sure. | |||
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