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The Range
Rifle & Shotgun Discussion
Function problem with a .308 build:
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<blockquote data-quote="Sgt Dog" data-source="post: 3830916" data-attributes="member: 15840"><p>The symptoms were common ones: Fired empty cases dribbling out, and failing to pick up and feed the next round, failing to lock back on an empty magazine. So I dove into some AR specific forums with questions.</p><p></p><p>After reviewing my choices for spring and buffers and airing both the symptoms and back-end set-up, posters convinced me it was in the front end. Stripped it down to confirm gas block port alignment, obstructions, etc. </p><p></p><p>After finding nothing there I was asked this question: “Did you ever check the diameter of the gas port in the barrel? Your recoil system is good, which leaves the gas system as the culprit”.</p><p></p><p>Dang!! A guy WOULD have already put the block, tube and hand-guard back on. So I repeat the tear-down and sure enough, the port is about 50% (by volume undersized) at .0770. I called Michael at Criterion Barrels to confirm. He couldn’t believe they shipped like that. Then he offers a shipping label and wants the whole upper shipped. </p><p></p><p>Meanwhile I reluctantly let myself be convinced that re-drilling the gas port myself is a piece of cake. (And btw, Criterion never followed-thru on the offer of a shipping label). </p><p></p><p>Anyway, the forum posters were right. Once I got the bit aligned with a tower of boxes holding my vice block, vice and rifle in position it WAS a piece of cake. I used a brass rod in the barrel to make sure I did no damage.</p><p></p><p>Anyway, lesson learned. And some experience gained. “Check the port size next time before you assume”! Especially with a .308.</p><p></p><p>In the short video I should have lingered on the stacked boxes/vice/rifle required to get the right alignment & height… if for nobothervreason than to show another budda at work. Kinda like the guys you see on a ladder set up on a stool off a lumber rack on a pickup bed!</p><p>[MEDIA=youtube]35B_WdLUFxA[/MEDIA]</p></blockquote><p></p>
[QUOTE="Sgt Dog, post: 3830916, member: 15840"] The symptoms were common ones: Fired empty cases dribbling out, and failing to pick up and feed the next round, failing to lock back on an empty magazine. So I dove into some AR specific forums with questions. After reviewing my choices for spring and buffers and airing both the symptoms and back-end set-up, posters convinced me it was in the front end. Stripped it down to confirm gas block port alignment, obstructions, etc. After finding nothing there I was asked this question: “Did you ever check the diameter of the gas port in the barrel? Your recoil system is good, which leaves the gas system as the culprit”. Dang!! A guy WOULD have already put the block, tube and hand-guard back on. So I repeat the tear-down and sure enough, the port is about 50% (by volume undersized) at .0770. I called Michael at Criterion Barrels to confirm. He couldn’t believe they shipped like that. Then he offers a shipping label and wants the whole upper shipped. Meanwhile I reluctantly let myself be convinced that re-drilling the gas port myself is a piece of cake. (And btw, Criterion never followed-thru on the offer of a shipping label). Anyway, the forum posters were right. Once I got the bit aligned with a tower of boxes holding my vice block, vice and rifle in position it WAS a piece of cake. I used a brass rod in the barrel to make sure I did no damage. Anyway, lesson learned. And some experience gained. “Check the port size next time before you assume”! Especially with a .308. In the short video I should have lingered on the stacked boxes/vice/rifle required to get the right alignment & height… if for nobothervreason than to show another budda at work. Kinda like the guys you see on a ladder set up on a stool off a lumber rack on a pickup bed! [MEDIA=youtube]35B_WdLUFxA[/MEDIA] [/QUOTE]
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