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The Range
Rifle & Shotgun Discussion
Function problem with a .308 build:
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<blockquote data-quote="Seadog" data-source="post: 3838630" data-attributes="member: 9018"><p>I had a similar occurrence. I built a MK12 mod 0 using a Criterion barrel in 5.56. The rifle was short stroking. Sometimes it would work but mostly it wouldn’t. It would fire off a round and then click, nothing. </p><p></p><p>The gun was so under gassed it would throw the empty brass out but it won’t go far enough back to strip a new round out and load it. No jamming. Just not going far enough back. After researching the gasport size I realized mine was undersized from what it should be. So me three, with the gas port being undersized. Bought the correct drill and opened it up. Now the rifle works. Other than the undersized gas port it has been an extremely accurate rifle.</p></blockquote><p></p>
[QUOTE="Seadog, post: 3838630, member: 9018"] I had a similar occurrence. I built a MK12 mod 0 using a Criterion barrel in 5.56. The rifle was short stroking. Sometimes it would work but mostly it wouldn’t. It would fire off a round and then click, nothing. The gun was so under gassed it would throw the empty brass out but it won’t go far enough back to strip a new round out and load it. No jamming. Just not going far enough back. After researching the gasport size I realized mine was undersized from what it should be. So me three, with the gas port being undersized. Bought the correct drill and opened it up. Now the rifle works. Other than the undersized gas port it has been an extremely accurate rifle. [/QUOTE]
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