View Full Version : how to see what size gas block
stx.dead.I
08-06-18, 19:29
I need to get an adjustable gas block for my suppressed sbr. I am literally sitting round from 12:15 to about 1:30 on the clock. I'm also getting some jams. it's a 10.5 faxon barrel with a suppressor. the only markings I can find on the barrel are 5.56 NATO 1-8T 416R.
Do yall think it would have what barrel profile or gas block size stamped somewhere else away from these marking? I don't want to have to remove my rail but as it's perfect on there. there's either .625 or .750 by this manufacturer
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everready73
08-06-18, 19:53
Read wrong
everready73
08-06-18, 19:57
Check out black River tactical gas block inserts to cut back the port size. It's cheaper and don't have to replace gas block. They also have gas tubes that reduce gas flow
Right way: buy calipers
Other way: wrap string around journal, mark intersects, measure and calculate circumference.
Call me crazy, but I can't figure out what the heck you are asking. Do you want to know what gas block size do you need? Or are you asking how to fix the malfunction issue?
stx.dead.I
08-06-18, 22:12
Call me crazy, but I can't figure out what the heck you are asking. Do you want to know what gas block size do you need? Or are you asking how to fix the malfunction issue?gas block size I need. hopefully the adjustable gas block will fix the issue. I might just order both sizes and return the one that doesn't fit! what's the go to adjustable gas block? I was thinking the seekins
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Your barrel is either a .625 or a .750. The Faxon website should have it listed and it should say which size.
gas block size I need. hopefully the adjustable gas block will fix the issue. I might just order both sizes and return the one that doesn't fit! what's the go to adjustable gas block? I was thinking the seekins
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everready73
08-07-18, 06:31
SLR or superlative arms are two of the better ones
If it is going to stay suppressed a gas block insert from BRT is cheaper and less moving parts
stx.dead.I
08-07-18, 07:27
Your barrel is either a .625 or a .750. The Faxon website should have it listed and it should say which size.the website does have it listed on their models and the 10.5 model barrels are either .625 or .750. I looked over the whole barrel and couldn't find any other markings
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stx.dead.I
08-07-18, 07:27
SLR or superlative arms are two of the better ones
If it is going to stay suppressed a gas block insert from BRT is cheaper and less moving partsit may not stay suppressed though
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everready73
08-07-18, 07:49
the website does have it listed on their models and the 10.5 model barrels are either .625 or .750. I looked over the whole barrel and couldn't find any other markings
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They only have 2 barrels in 10.5 that are 556. A pencil profile and govt profile. What profile is your barrel? Pencil is skinny for the entire length of the barrel and has.625 and the govt has pencil profile to the gas block then is thicker on the end and is .750. That would be the easiest way to tell without removing anything
stx.dead.I
08-07-18, 08:06
They only have 2 barrels in 10.5 that are 556. A pencil profile and govt profile. What profile is your barrel? Pencil is skinny for the entire length of the barrel and has.625 and the govt has pencil profile to the gas block then is thicker on the end and is .750. That would be the easiest way to tell without removing anythingahh sweet thanks! I couldn't tell a difference in the pic at first glance but now I can see a difference. will look when I get home. thanks!
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ahh sweet thanks! I couldn't tell a difference in the pic at first glance but now I can see a difference. will look when I get home. thanks!
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I don't understand why you don't just take off the handguard and measure it. You are going to have to take it off anyway. What's the big deal??
stx.dead.I
08-07-18, 17:35
I don't understand why you don't just take off the handguard and measure it. You are going to have to take it off anyway. What's the big deal??cause I don't have calipers. I bought a 750 block today that I'm pretty sure will work
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Mike Miller
08-07-18, 17:46
?
Just hold a ruler up to it
bamashooter
08-07-18, 19:55
I need to get an adjustable gas block for my suppressed sbr. I am literally sitting round from 12:15 to about 1:30 on the clock. I'm also getting some jams. it's a 10.5 faxon barrel with a suppressor. the only markings I can find on the barrel are 5.56 NATO 1-8T 416R.
Do yall think it would have what barrel profile or gas block size stamped somewhere else away from these marking? I don't want to have to remove my rail but as it's perfect on there. there's either .625 or .750 by this manufacturer
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The only Faxon 10.5" stainless (416R) / (5.56) I find is a carbine - length w/ a .750" gas block diameter. (.080" gas port).
stx.dead.I
08-07-18, 20:02
The only Faxon 10.5" stainless (416R) / (5.56) I find is a carbine - length w/ a .750" gas block diameter. (.080" gas port).well, I can't get the dang gas tube out of my original gas block so install is on hold till I get a new tube...lol
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Mike Miller
08-07-18, 20:20
Put an adjustable wrench around your gas tube, leaving a bit of a gap. Hold the gas tube, and let the gas block hang low a couple of inches off the carpet. Whack the gas block down with the wrench, still holding the gas tube. You're not beating on it, just let gravity do most of the work. A couple hits and it should be free, assuming the roll pin was removed.
everready73
08-08-18, 09:28
well, I can't get the dang gas tube out of my original gas block so install is on hold till I get a new tube...lol
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Right To Bear has Superlative Arms and SLR (with free gas tube) options at good prices with free shipping usually. You have to add to your cart sometimes to see the sale pricing. They are good to go, I have ordered form them multiple tmes. Fast shipping as well
https://www.righttobear.com/Adjustable-AR-15-Gas-Blocks-s/1988.htm
bamashooter
08-08-18, 15:54
well, I can't get the dang gas tube out of my original gas block so install is on hold till I get a new tube...lol
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Not being a smart-butt; did you remove the roll pin?
stx.dead.I
08-08-18, 16:42
haha ya I did, i used the wrench around the tube and after about 30 smacks it came off
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bamashooter
08-08-18, 17:53
Good deal. That was a good idea. Any idea how many rounds through that block / tube?
BTW.... a 3/4" open ended wrench... is .750" ID... so in this case , calibers are not needed.
If your muzzle device is pinned and welded... consider an adj. Gas Key
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