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The Basics, Starting Out
Semi auto advice needed
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<blockquote data-quote="MSURunner" data-source="post: 2714411" data-attributes="member: 102961"><p>Cycling issues with an adjustable gas block are generally REALLY easy to fix. Here is my process that usually gets the gas system tuned within 5 shots. If you have a suppressor, it can take more to fine tune it as you may need to increase buffer mass to hit a sweet spot between gas block settings.</p><p></p><p>1. Close the gas block off completely.</p><p>2. Load a single round into a magazine.</p><p>3. Fire single round.</p><p>4. Diagnose: If the bolt does not lock back, open gas block another click and repeat. If bolt does lock back, take a look at ejection pattern. 12 o'clock to 2 o'clock, potentially over-gassed/under-weighted. If closing the gas block another click doesn't lock the bolt back, look to increase buffer weight/spring. If 4 o'clock to 6 o'clock, potentially under-gassed/over-weighted. If opening the gas block another click doesn't provide better ejection (ideal is 3 o'clock), then look to decrease buffer mass/spring.</p><p>5. Repeat steps 2-4 as necessary. For reliability sake, I would prefer a slightly over-gassed AR to and under-gassed one. I'll take a bit more wear and tear on brass and buffers/springs to ensure that I will have another round in the chamber and ready to fire when I need it.</p></blockquote><p></p>
[QUOTE="MSURunner, post: 2714411, member: 102961"] Cycling issues with an adjustable gas block are generally REALLY easy to fix. Here is my process that usually gets the gas system tuned within 5 shots. If you have a suppressor, it can take more to fine tune it as you may need to increase buffer mass to hit a sweet spot between gas block settings. 1. Close the gas block off completely. 2. Load a single round into a magazine. 3. Fire single round. 4. Diagnose: If the bolt does not lock back, open gas block another click and repeat. If bolt does lock back, take a look at ejection pattern. 12 o'clock to 2 o'clock, potentially over-gassed/under-weighted. If closing the gas block another click doesn't lock the bolt back, look to increase buffer weight/spring. If 4 o'clock to 6 o'clock, potentially under-gassed/over-weighted. If opening the gas block another click doesn't provide better ejection (ideal is 3 o'clock), then look to decrease buffer mass/spring. 5. Repeat steps 2-4 as necessary. For reliability sake, I would prefer a slightly over-gassed AR to and under-gassed one. I'll take a bit more wear and tear on brass and buffers/springs to ensure that I will have another round in the chamber and ready to fire when I need it. [/QUOTE]
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