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Posted: 5/8/2005 5:40:49 PM EDT
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I just finished a new build on an AR pistol. As usual I was excited to try it out. I got to the range and the first few rounds failed to go into battery without a little push. After that is was smooth sailing. Factory Remington 55gr rounds. No sign of high pressure. I ran 4 30 round clips with no hang-ups. I got home and started to clean it up. I noticed that the aluminum gas block looked like someone had taken a mini blowtorch and burned straight down around the gas tube. Hot gas had blown around the gas tube and shot out the top of the gas block. This was a low profile aluminum block. I spent an hour looking at this. Everything was in alignment. Hole in gas block was centered over the hole in barrel. Barrel, Gas Block, Gas Tube all new. I’ve heard of a little blow by from around the gas block. This is something new to me. I took some good photos but I took them in high resolution and I can’t seem to send then to the server. File is too big. I’ll try to shrink them tomorrow at work and post them. Anyone ever experience this before? Should have I opted for the steel gas block? Any input will be appreciated. Keep your powder dry. BigHitter    |
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It works but I can't believe I didn't notice hot gas shooting straight up. It's totally unacceptable to me. I took it apart to try and figure it out. The hole in the gas block that lets gas up to the tube is as large as the DIA of the tube. Maybe bigger. I really didn't look at the size of the hole before the build but it's pretty large. Why would the gas burn straight thru a block of aluminum? Shouldn't it take the path of least resistance? IE the gas tube? For all I know there could have been porosity in the gas block or it could have been drilled too deep. I can handle a poor part. No big deal. Next time I buy a steel block. If I did something wrong that caused the failure I want to know so I don't do it again. BigHitter |
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Another example of poor reading comprehension..... From what I gather , the gas block actualy now has a hole from the top of the block all the way to the gas hole in the barrel, with the exception of the gas tube ? Right? The gas isnt blowing past the tiny clearance space around the tube, it either made a new hole straight up or as you suggested the block may have been over drilled and the gas blew it th rest of the way open. Pics would be cool but it seems you got a shody gas block too me. Id get a steel one and be done with it... ETA: your gas tube doesnt have a hole all the way thru it does it? |
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I'll post photos tomorrow. Just so you can see how weird it is. No the gas tube is not drilled all the way thru. I've got good pics of the gas tube too. I think you're right. I believe the gas block was over drilled. Just short of all the way. There's no way it would have failed like this. The erosion of the metal looks like wormy chestnut. Very weird. I wish I could remember where I got the gas block. I'll look thru some receipts. BigHitter |
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