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<blockquote data-quote="diggler1833" data-source="post: 3980679" data-attributes="member: 48072">Not a hybrid, but have one Criterion barrel.I could not get my rifle to cycle light ammo, and it never locked back on an empty magazine.&nbsp; Springs, buffers, gas blocks, and reassembling the upper three times and still no luck.My 18&quot;, .308 barrel with rifle length gas had a .068 gas port when I measured it.&nbsp; Checking the interwebs, that seemed about .025 small.&nbsp; I called Criterion and was politely told that I was wrong...yet I still couldn&#039;t get the gun to cycle.&nbsp; They did tell me my buffers weren&#039;t heavy enough.Finally on another forum, the owner of AR Performance messaged me directly and told me that I should have a .093 gas port, and walked me through how to open mine up since I have a drill press...really pretty simple operation as long as you&#039;re careful.Rifle has never had a hiccup since.I bought my last Criterion barrel ever.The good news is that I got pretty proficient at disasseming and reassembling an AR upper.</blockquote>

[QUOTE="diggler1833, post: 3980679, member: 48072"] Not a hybrid, but have one Criterion barrel. I could not get my rifle to cycle light ammo, and it never locked back on an empty magazine. Springs, buffers, gas blocks, and reassembling the upper three times and still no luck. My 18", .308 barrel with rifle length gas had a .068 gas port when I measured it. Checking the interwebs, that seemed about .025 small. I called Criterion and was politely told that I was wrong...yet I still couldn't get the gun to cycle. They did tell me my buffers weren't heavy enough. Finally on another forum, the owner of AR Performance messaged me directly and told me that I should have a .093 gas port, and walked me through how to open mine up since I have a drill press...really pretty simple operation as long as you're careful. Rifle has never had a hiccup since. I bought my last Criterion barrel ever. The good news is that I got pretty proficient at disasseming and reassembling an AR upper. [/QUOTE]

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