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The Range
Rifle & Shotgun Discussion
My 300 Blackout will not cycle subsonic
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<blockquote data-quote="aestus" data-source="post: 2794258" data-attributes="member: 2989"><p>Did you say 16" barrel with a midlength gas system? Like the same mid-length gas that's on a 5.56/223 rifle?</p><p></p><p>If so, that's your problem. 300 blackout uses very fast pistol powders and the pressure spikes optimum for cycling happens early. 300 blackout optimized with pistol length gas systems. For 16" barrels, you can get away with a carbine length gas if you know your loads, but it is still often recommended that a pistol length gas is used even for a 16" barrel. Using a longer gas system will result in not enough pressure going through the system to reliably cycle the rifle as the pressures will already have come down by the time gas is being pushed to your bcg.</p></blockquote><p></p>
[QUOTE="aestus, post: 2794258, member: 2989"] Did you say 16" barrel with a midlength gas system? Like the same mid-length gas that's on a 5.56/223 rifle? If so, that's your problem. 300 blackout uses very fast pistol powders and the pressure spikes optimum for cycling happens early. 300 blackout optimized with pistol length gas systems. For 16" barrels, you can get away with a carbine length gas if you know your loads, but it is still often recommended that a pistol length gas is used even for a 16" barrel. Using a longer gas system will result in not enough pressure going through the system to reliably cycle the rifle as the pressures will already have come down by the time gas is being pushed to your bcg. [/QUOTE]
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My 300 Blackout will not cycle subsonic
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