Originally posted by grayfox
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20" Barrel, Adjustable gas block needed?
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Retired Army Airborne Infantry
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I originally had BCM KMR Alpha rail (1.3 inner diameter) on my build that I believe the low-profile Faxon GB was vibrating against the rail giving me vertical stringing and as soon as I replaced it with a MI SP-Series (Suppressor Compatible) Rail the vertical stringing went away I am now getting good groups.
At first I thought there would be no problem because it did clear by a bit when looking at it inside the rail. When just flexing the barrel by hand it seemed to flex a lot more with the BCM KMR Alpha than it does with the larger more sturdy barrel nut of MI.
I also noticed with a couple of BCM KMR rails I used in the past it seemed that the barrel nut is made of a soft metal and marred very easy even when only torquing to 40 foot-pounds as per instructions from BCM.
When I installed the MI rail I went with Bill Alexander's advice and didn't want to torque any less than 60 foot-pounds and ended up making it to almost 80 foot-pounds when everything lined up and that seemed to do the trick.Last edited by Gman6.5; 09-17-2017, 05:23 PM.
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Originally posted by sawacs View PostHdrolling, good luck with the gas block and the build.
For what its worth, I had to grind a little from the SOLO rail to be certain the gas block would not rub the rail. The S7 gas block was just too close for my comfort zoneRetired Army Airborne Infantry
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I went with the Rubber City Bolt Carrier w/ adjustable gas key instead of adjustable gas block.
Blacknitride+ Enhanced Made from 8620 steel With billet adjustable gas key side staked RCA patented pending adjustable gas system. Adjust gas at the carrier to avoid the need for changing your gas block. Includes: Directions, 3 1/8 screws and 2 3/16 set screws and wrench included to make necessary adjustments.Last edited by Difranco; 09-24-2017, 04:55 AM.When you clean the vacuum cleaner you become the vacuum cleaner.
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I have a 20 inch Odin barrel on one of my grendles. Odin told me I would not need an adjustable gas block. Having more money than sense I ordered one of their adjustable blocks screwed up and clicked set screw one vs clamp on that I really wanted. Pretty sure I could have sent back and got the clamp on but bird in hand I installed and works fine. Easy to adjust with the extended ball tip screw driver. Odin has witness mark on barrel and block slide up till hits collar align two marks tighten set screws. I did remove set screw to verify the holes lined up when block against collarQueen of Battle
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I ended up using the SLR adjustable and dialed it in Mon, very easy to use and glad I decided to try it.
When Installing I also used the SLR barrel dimple jig to align the gas hole to the where the dimples needed to be drilled on the opposite side, worked perfect and made the job simple.
IMG_9005 by hd_rolling, on Flickr
IMG_9004 by hd_rolling, on Flickr
IMG_9006 by hd_rolling, on FlickrRetired Army Airborne Infantry
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Originally posted by Difranco View PostI went with the Rubber City Bolt Carrier w/ adjustable gas key instead of adjustable gas block.
https://rubbercityarmory.com/product...djustable-key/
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And the block cleared the hand guard easily top and bottom.
IMG_9023 by hd_rolling, on Flickr
IMG_9015 by hd_rolling, on FlickrRetired Army Airborne Infantry
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Originally posted by Lastrites View PostI often wonder why more guys don't try to run one of these or just buy the adjustable key for about $40 and add to your b/c instead of going with the adj gas blocks that at times have issues with access to the adjustment screws.Retired Army Airborne Infantry
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