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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Dmr/sdmr build and testing report.
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<blockquote data-quote="budlight" data-source="post: 1312985" data-attributes="member: 2939"><p>You don't need an adjustable gas block on a rifle length gas tube. I can't find the test article, but max pressure is achieved very early in the bullets travel down the barrel. So don't quote my numbers. They are from memory. on a round loaded to about 53,000 psi The gas port on a carbine length gas tube gets about 30,000 psi The mid length was 22000 and the rifle length was 17,000. They did state slow burning powder and bullet weights could change these up and down.</p><p></p><p>I have friends with carbines and light weight BCG and when you open them up for cleaning after a few hundred rounds on a new AR the buffer tube weight face is marked up from getting slammed by the BCG. The small piece called a "cam pin" located underneath the gas key is already visibly warn already.</p><p></p><p>My mentor told me to use the heavy full auto bolts, longer gas tubes, and possibly even heavier buffer tube weights. It all slows down the cyclic rate. I've even messed with the buffer tube end hole diameter and using flat wound springs to quiet the cycle.</p><p></p><p>You want everything in harmony to eject your rounds every time. I have some that put all the casing in a pile about the two O'clock position and others clear back to around to nearly 5 O'clock</p></blockquote><p></p>
[QUOTE="budlight, post: 1312985, member: 2939"] You don't need an adjustable gas block on a rifle length gas tube. I can't find the test article, but max pressure is achieved very early in the bullets travel down the barrel. So don't quote my numbers. They are from memory. on a round loaded to about 53,000 psi The gas port on a carbine length gas tube gets about 30,000 psi The mid length was 22000 and the rifle length was 17,000. They did state slow burning powder and bullet weights could change these up and down. I have friends with carbines and light weight BCG and when you open them up for cleaning after a few hundred rounds on a new AR the buffer tube weight face is marked up from getting slammed by the BCG. The small piece called a “cam pin” located underneath the gas key is already visibly warn already. My mentor told me to use the heavy full auto bolts, longer gas tubes, and possibly even heavier buffer tube weights. It all slows down the cyclic rate. I've even messed with the buffer tube end hole diameter and using flat wound springs to quiet the cycle. You want everything in harmony to eject your rounds every time. I have some that put all the casing in a pile about the two O'clock position and others clear back to around to nearly 5 O'clock [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Dmr/sdmr build and testing report.
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