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+--- Thread: Homemade Adjustable Gas Block (/showthread.php?tid=9447)
Homemade Adjustable Gas Block - badmoon692008 - 06-02-2015
I tried a search and didn't find any evidence of someone making their own adjustable gas block on this forum. I'm having issues with my shells extracting early and turning into belted cartridges, and I've already gone well over budget on this build, so instead of dropping money on an adjustable gas block why not make my own? Threw it on the mill to put a flat in it, drilled a hole, tapped it and put in a set screw. Planning on dialing it in tonight and then locktiting it in place. Wish me luck! I'll let you know how it goes.
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Homemade Adjustable Gas Block - ricsmall - 06-02-2015
I've often thought this would work. Keep us updated.
Richard
Homemade Adjustable Gas Block - NugginFutz - 06-02-2015
Can't see why it would not work. Curious, though - what steel is the set screw made of? Any thought on its tolerance to high temp gasses? Even if the screw erodes, a steady supply of replacements would still make this cheaper than buying a "tailor made" version.
Homemade Adjustable Gas Block - motoxxx_ryder - 06-02-2015
if it works would you be willing to do another for a few bucks for your labor lol. Im getting slightly belted cases every now and then.
Homemade Adjustable Gas Block - badmoon692008 - 06-02-2015
NugginFutz Wrote:Can't see why it would not work. Curious, though - what steel is the set screw made of? Any thought on its tolerance to high temp gasses? Even if the screw erodes, a steady supply of replacements would still make this cheaper than buying a "tailor made" version.I thought about this as well, I figured I'll just wait and see... If I have issues with the screws eroding quickly maybe I'll look into sourcing a screw made of a different material... As of now it's just a random set screw from the hardware store.
Homemade Adjustable Gas Block - badmoon692008 - 06-02-2015
motoxxx_ryder Wrote:if it works would you be willing to do another for a few bucks for your labor lol. Im getting slightly belted cases every now and then.I don't see why not... although once you factor in shipping both ways and down time (I don't know about you but I shoot just about every week during the summer) it might not be worth it. Also pending how long the screws last it might not be the best option to begin with. How many rounds do you have through your gun? I know it was a real bitch to get the gas tube out of the block and mine only had 60 rounds through it. so that's something to consider as well.
Homemade Adjustable Gas Block - motoxxx_ryder - 06-02-2015
badmoon692008 Wrote:I don't see why not... although once you factor in shipping both ways and down time (I don't know about you but I shoot just about every week during the summer) it might not be worth it. Also pending how long the screws last it might not be the best option to begin with. How many rounds do you have through your gun? I know it was a real bitch to get the gas tube out of the block and mine only had 60 rounds through it. so that's something to consider as well.
arounr 250 rounds, my shootign slows down in the summer, something about 110 degree heat lol. Well let us know how it holds up long term! would be cool to see.
Homemade Adjustable Gas Block - badmoon692008 - 06-03-2015
First try was a bust. Even with the set screw turned all the way in the bolt still locked back and while it seemed to help the belted cartridges at first, when I switched to the second box of ammo they started getting belted again (all factory hornady 123 amax rounds)...I think I'll try to drill it out and put in a bigger set screw... right now it's only a 3mm screw... I'll try drilling it out to 4mm and see how that goes.
Homemade Adjustable Gas Block - montana - 06-03-2015
I know it was a real bitch to get the gas tube out of the block and mine only had 60 rounds through it. so that's something to consider as well.[/QUOTE]
I glued some thick leather straps on my bench vice jaws along time ago and they are still working great. After removing the gas tube roll pin, I tighten my leather covered vice jaws on the gas tube and tap a little on the upper receiver and the gas tubes come out every time. Trust me it works every time.
Homemade Adjustable Gas Block - NugginFutz - 06-03-2015
badmoon692008 Wrote:First try was a bust. Even with the set screw turned all the way in the bolt still locked back and while it seemed to help the belted cartridges at first, when I switched to the second box of ammo they started getting belted again (all factory hornady 123 amax rounds)...I think I'll try to drill it out and put in a bigger set screw... right now it's only a 3mm screw... I'll try drilling it out to 4mm and see how that goes.
Well, it stands to reason that in order to block the gas flow, the setscrew needs to be at least the same diameter as the gas journal in the block.
Homemade Adjustable Gas Block - badmoon692008 - 06-03-2015
NugginFutz Wrote:Well, it stands to reason that in order to block the gas flow, the setscrew needs to be at least the same diameter as the gas journal in the block.I figured even if the screw was smaller, then it would act like a partially opened adjustable block, impeding at least some of the gas. Also, 3mm gave me a little more wiggle room in case I messed something up... Obviously it didn't work out like I'd hoped... Worst case it doesn't work and I just fill in the hole, or leave it with the screw in and have to buy an adjustable one anyways... I'll update again once I get the bigger screw in and have a chance to try it out.
Homemade Adjustable Gas Block - am4966 - 06-03-2015
Joe Bob's outfitter adjustable Gas block 29.99, price of a non adjustable or less.
Homemade Adjustable Gas Block - badmoon692008 - 06-03-2015
am4966 Wrote:Joe Bob's outfitter adjustable Gas block 29.99, price of a non adjustable or less.Damn, that's good to know... now I wish I would have just bought one of those from the beginning...
Homemade Adjustable Gas Block - sneaky one - 06-04-2015
badmoon, you did a great service to a many on here. No worrys of how long the screw will last, as they are easily swapped out, as the corrosiveness affects them, nice- I'm off to Blades mill ASAP. Thread pitch?
Homemade Adjustable Gas Block - am4966 - 06-04-2015
WMD Guns does nitriding of small gun parts. Along with other things. Website is down you could do a few screws that would help with strength and heat abuse. Just a thought too
Homemade Adjustable Gas Block - badmoon692008 - 06-04-2015
sneaky one Wrote:badmoon, you did a great service to a many on here. No worrys of how long the screw will last, as they are easily swapped out, as the corrosiveness affects them, nice- I'm off to Blades mill ASAP. Thread pitch?
I just guessed on the 3mm and found one that was the right length, pitch ended up being M3x0.5... I'm drilling it out today to 4mm and putting in a larger set screw because the 3mm was not large enough to sufficiently block the gas flow.
Homemade Adjustable Gas Block - sneaky one - 06-05-2015
Nice work. Thanks for the updates. Good call on the larger unit screw .. Keep us all updated as you can . can't beat an inventor up much. I'm one myself, I can stand my own ground.
I'm Glad that a many like you are onboard now days. We can find new fixes on these weapons together , with the military guys on here- the AR will be cured of all old issueses eventually. Sweetness is close.
Homemade Adjustable Gas Block - Rust - 06-16-2015
I've done two of these, I believe I had posted about it but since all my posts went up in smoke with the spam attack... Anyway, I did one in an old aluminum DPMS set screw mount that I slotted and made clamping. And one with a YHM steel two piece. I think I used 8x32 threads on them but its been several years and I don't have either handy right now.
The first one I did (DPMS) I screwed up and set the tapped hole a little bit to low, and the screw just kisses the top of the barrel. It adjusts fine, but you have to remove the screw to remove/install the gas block. (don't make that same mistake) I actually did some measuring on the steel one and its fine. I use stainless set screws in the hopes they last a little longer since it has a higher melting point, but since the screws are made of who knows what alloy it may be a wash. It has seen maybe 500 rounds of Grendel without wear issues so far.
Honestly I really like the low profile Syrac, and SLR adjustables. They're a lot more money than modding one yourself, but I think with the low profile, and detent, it's a better finished product. If you want a rail then doing it yourself is a good option. I may even try to add a detent to mine at some point as I have had the screw back out a little before it got enough fouling to hold it in place.