Posted: 3/8/2015 12:04:26 PM EDT
| Anybody know what the diameter of the gas port hole in a gas block is? I'm assuming all gas blocks would have the same size hole. |
| I'm in the process of trying to make a adjustable gas block. I want to use a 10-32 socket set screw, but I'm not sure that the diameter (.190) of a 10-32 set screw will completely cover the hole in the gas block. If I knew the diameter of the hole in the gas block, I will know if it will work. |
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Quoted: So a 10-32 set screw be big enough to cover the hole. Thank you sir, greatly appreciated. Quoted: Quoted: I use .156 in my gas blocks. That seems to be very common.Military forged sight base is in the .150-.155 range. Craig So a 10-32 set screw be big enough to cover the hole. Thank you sir, greatly appreciated. |
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I think I smell what you're stepping in there.... I have a "bolt action" gun that I removed the gas tube, and turned the gas block around (low profile) to cover the gas port in the barrel. No need to put a set screw in the hole in the gas block. Quoted:
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I use .156 in my gas blocks. That seems to be very common.Military forged sight base is in the .150-.155 range. Craig So a 10-32 set screw be big enough to cover the hole. Thank you sir, greatly appreciated. I already built a single shot AR with a side charging handle. 
I used a solid rod in the gas block and installed the gas tube roll pin. What I'm actually trying to make is an adjustable gas block. The set screw will come in from the front of the gas block just above the hole for the barrel and just below the hole for the gas tube. With tightening and loosening the set screw, I will be able to control the gases coming from the barrel. |
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Quoted: I already built a single shot AR with a side charging handle. http://imagizer.imageshack.us/v2/640x480q90/843/o812.jpg http://imagizer.imageshack.us/v2/640x480q90/835/zlwh.jpg http://imagizer.imageshack.us/v2/640x480q90/842/rkfb.jpg I used a solid rod in the gas block and installed the gas tube roll pin. What I'm actually trying to make is an adjustable gas block. The set screw will come in from the front of the gas block just above the hole for the barrel and just below the hole for the gas tube. With tightening and loosening the set screw, I will be able to control the gases coming from the barrel. Quoted: Quoted: Quoted: Quoted: I use .156 in my gas blocks. That seems to be very common.Military forged sight base is in the .150-.155 range. Craig So a 10-32 set screw be big enough to cover the hole. Thank you sir, greatly appreciated. I already built a single shot AR with a side charging handle. http://imagizer.imageshack.us/v2/640x480q90/843/o812.jpg http://imagizer.imageshack.us/v2/640x480q90/835/zlwh.jpg http://imagizer.imageshack.us/v2/640x480q90/842/rkfb.jpg I used a solid rod in the gas block and installed the gas tube roll pin. What I'm actually trying to make is an adjustable gas block. The set screw will come in from the front of the gas block just above the hole for the barrel and just below the hole for the gas tube. With tightening and loosening the set screw, I will be able to control the gases coming from the barrel. any issues with sticking cases in the boar on the straight pull? |
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any issues with sticking cases in the boar on the straight pull? Quoted:
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I use .156 in my gas blocks. That seems to be very common.Military forged sight base is in the .150-.155 range. Craig So a 10-32 set screw be big enough to cover the hole. Thank you sir, greatly appreciated. I already built a single shot AR with a side charging handle. http://imagizer.imageshack.us/v2/640x480q90/843/o812.jpg http://imagizer.imageshack.us/v2/640x480q90/835/zlwh.jpg http://imagizer.imageshack.us/v2/640x480q90/842/rkfb.jpg I used a solid rod in the gas block and installed the gas tube roll pin. What I'm actually trying to make is an adjustable gas block. The set screw will come in from the front of the gas block just above the hole for the barrel and just below the hole for the gas tube. With tightening and loosening the set screw, I will be able to control the gases coming from the barrel. any issues with sticking cases in the boar on the straight pull? Nothing yet 
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Quoted:
any issues with sticking cases in the boar on the straight pull? Quoted:
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I use .156 in my gas blocks. That seems to be very common.Military forged sight base is in the .150-.155 range. Craig So a 10-32 set screw be big enough to cover the hole. Thank you sir, greatly appreciated. I already built a single shot AR with a side charging handle. http://imagizer.imageshack.us/v2/640x480q90/843/o812.jpg http://imagizer.imageshack.us/v2/640x480q90/835/zlwh.jpg http://imagizer.imageshack.us/v2/640x480q90/842/rkfb.jpg I used a solid rod in the gas block and installed the gas tube roll pin. What I'm actually trying to make is an adjustable gas block. The set screw will come in from the front of the gas block just above the hole for the barrel and just below the hole for the gas tube. With tightening and loosening the set screw, I will be able to control the gases coming from the barrel. any issues with sticking cases in the boar on the straight pull? He has a giant feral pig??? |
Well, I finally finished the adjustable gas block. I used a standard YHM low profile gas block (9383). I drilled and tapped a 6-32" hole right below the gas tube which intersects the hole in the gas block. I used 6-32 x 3/4" long set screw to control the amount of gas that goes into the gas tube. I then drilled and tapped a 4-40 hole through the side of the gas block and inserted a brass set screw so I could lock the 6-32 set screw in place, after I adjust it exactly where I need it. Here are a few pics to better explain. I only have a couple of bucks in the set screws, so I guess the whole thing cost me around $25.00 including the gas block.
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