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Posted: 9/9/2025 12:17:03 PM EST
[Last Edit: JD42][Edited]
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I am thinking about a Lima 6 kit. But they requires a side mounted gas hole in barrel. Why not use an angled gas tube similar to the pig tail type? This would allow you to use just about any AR15 barrel. You would just need to bend it to size.Attached File |
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Originally Posted By JD42: The gas hole is drilled in the side off the barrel. For the side mounted gas tube. I do not think you can use std AR barrels. Without drilling a new hole. It would be nice to use std barrels and just slightly bend the gas tube to fit. Thats not correct Attached File It uses a standard ar barrel installed 90 degrees from normal and a special gas block to bring the tube back to the top position. |
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Originally Posted By SGT-Fish: Those gas tube's don't handle high rates of fire well. But you could probably make your to try. I was planning on using a large volume gas tube. I have TIG welded my own to do 'constant recoil' M16 configurations as I have documented on my site here: https://c3junkie.com/?page_id=1403 However, now thinking about the offset, it maybe good to copy what LaFrance did with a twist.  Below is a picture of one of my LaFrance gas tubes. Make a box like that for increased volume and do the offset at the same time?  |
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An angled tube is not a good idea. You want to keep the gas tube as straight as possible, so when it gets super hot, it doesn't blow forward and out of the gas key. If you had the rear end of the gas tube secured, it might work, but just hanging/dangling out loose like an AR-15, no way. Unfortunately, I have a bit of experience here building the Tromix Siamese-16 and Trimese-16 with non-straight gas tubes. Tony  |
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Originally Posted By TonyRumore: An angled tube is not a good idea. Â You want to keep the gas tube as straight as possible, so when it gets super hot, it doesn't blow forward and out of the gas key. Â If you had the rear end of the gas tube secured, it might work, but just hanging/dangling out loose like an AR-15, no way. Unfortunately, I have a bit of experience here building the Tromix Siamese-16 and Trimese-16 with non-straight gas tubes. Tony https://i.imgur.com/EW5kavC.jpeg @TonyRumore I always get a kick when ya post that. 
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Originally Posted By TonyRumore: An angled tube is not a good idea. Â You want to keep the gas tube as straight as possible, so when it gets super hot, it doesn't blow forward and out of the gas key. Â If you had the rear end of the gas tube secured, it might work, but just hanging/dangling out loose like an AR-15, no way. Unfortunately, I have a bit of experience here building the Tromix Siamese-16 and Trimese-16 with non-straight gas tubes. Tony https://i.imgur.com/EW5kavC.jpeg Always an inspiration sir! Ha! Thinking a heavy double walled gas tube would be the ticket. Until conversion over to piston! The gas block has a key cut that transitions the gas where it needs to go for those who don't want to drill a barrel. |
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Originally Posted By tommyidone: The old ports end up filling up with carbon and copper and essentially welding themselves shut You can see it at the 19:40 mark - https://youtu.be/8FV6JRMb0Xs?si=TNMF4EEsW9DSzV2M&t=1181 Yea, when I first seen that, I thought that was pretty cool. The old hole gets completely sealed. It looks like it has been brazed or welded closed. |
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