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POF fluted chamber
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<blockquote data-quote="Kennibear" data-source="post: 914975" data-attributes="member: 51650"><p>Stoner did not need a fluted chamber for the AR. Kalashnikov did not use a fluted chamber in the AK.The FN-FAL has a normal chamber. All gas guns. Timing counts. Gas guns have an unlocking/ extraction start delayed by the gas tap off requiring time to set the action in motion. So the chamber pressure drops and the case relax away from the chamber wall.</p><p></p><p>Recoil/inertia based actions begin unlocking/extraction as soon as the recoil imparts motion to the gun. The chamber pressure is reduced but far from zero. With most brass (338 Lapua is an exception) containing maybe 5Kpsi anything higher is jamming the case against the wall.</p><p></p><p>That being said the needs of tactical arms are: reliability, ruggedness, simplicity, and durability. Roller locked actions deliver that set of qualities very well. But they require a fluted chamber for reliable extraction. The fluted chamber costs more to manufacture but it is made up on the simplicity of the rest of the mechanism. They are cleaner opperating as gas doesn't bath the action every shot.</p><p></p><p>Middle son has AR's, AK and CETME autos. He loves his CETME.</p><p></p><p>Nuff' said!</p><p></p><p>KB</p></blockquote><p></p>
[QUOTE="Kennibear, post: 914975, member: 51650"] Stoner did not need a fluted chamber for the AR. Kalashnikov did not use a fluted chamber in the AK.The FN-FAL has a normal chamber. All gas guns. Timing counts. Gas guns have an unlocking/ extraction start delayed by the gas tap off requiring time to set the action in motion. So the chamber pressure drops and the case relax away from the chamber wall. Recoil/inertia based actions begin unlocking/extraction as soon as the recoil imparts motion to the gun. The chamber pressure is reduced but far from zero. With most brass (338 Lapua is an exception) containing maybe 5Kpsi anything higher is jamming the case against the wall. That being said the needs of tactical arms are: reliability, ruggedness, simplicity, and durability. Roller locked actions deliver that set of qualities very well. But they require a fluted chamber for reliable extraction. The fluted chamber costs more to manufacture but it is made up on the simplicity of the rest of the mechanism. They are cleaner opperating as gas doesn't bath the action every shot. Middle son has AR's, AK and CETME autos. He loves his CETME. Nuff' said! KB [/QUOTE]
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POF fluted chamber
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