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The Range
Firearms Chat
AR PISTOL NOT CYCLING
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<blockquote data-quote="Jason L" data-source="post: 3649105" data-attributes="member: 45450"><p>You have several things going on here. The upper works on a different lower "flawlessly" and the new folding lower works with a different upper. What is the length of the other upper that is working with the folder? </p><p></p><p>If the gun was running flawlessly on a different lower and then started this with the folding lower only, I would start with the buffer weight and spring. The buffers for the folding lowers are proprietary, but they do make different weights of them. See if you can find a lighter buffer to run with the short barreled upper (or lighter spring). If you are dead set on running the short upper on the folding lower, then this is where I would start, before you change anything on the upper to make it run. After that would be to pin guage the gas port and see where it is, and maybe enlarge it to make it run on that lower. Only problem then is it may be to overgassed to run on your other lowers which will wear other parts faster.</p></blockquote><p></p>
[QUOTE="Jason L, post: 3649105, member: 45450"] You have several things going on here. The upper works on a different lower "flawlessly" and the new folding lower works with a different upper. What is the length of the other upper that is working with the folder? If the gun was running flawlessly on a different lower and then started this with the folding lower only, I would start with the buffer weight and spring. The buffers for the folding lowers are proprietary, but they do make different weights of them. See if you can find a lighter buffer to run with the short barreled upper (or lighter spring). If you are dead set on running the short upper on the folding lower, then this is where I would start, before you change anything on the upper to make it run. After that would be to pin guage the gas port and see where it is, and maybe enlarge it to make it run on that lower. Only problem then is it may be to overgassed to run on your other lowers which will wear other parts faster. [/QUOTE]
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AR PISTOL NOT CYCLING
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