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The Water Cooler
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<blockquote data-quote="dennishoddy" data-source="post: 3153567" data-attributes="member: 5412"><p>When the round leaves the chamber, some of the gas is collected and passes through a drilled port in the barrel. Gas then goes through the gas tube under the handguard back to the gas key which sits on top of the Bolt Carrier Group. The exhaust gasses causes the bolt to cycle to the rear and cycle the action. When the bolt carrier cycles, it disengages the gas tube from the gas key while its cycling. When it cycles back into battery, the gas tube is back inside the gas key waiting on the next charge of gas to cycle the bolt carrier again. I think it's like up to 50,000 psi that comes down the gas tube into the gas key to cycle the bolt.</p><p>This is what the gas key that is properly staked looks like on a BCG, bolt carrier group. (I'm also including the acronyms that are commonly used by AR builders)</p><p></p><p><img src="https://sp.yimg.com/ib/th?id=OIP.UNTWkdrCu-4_vm_pfABkKgHaFj&pid=15.1&rs=1&c=1&qlt=95&w=157&h=118" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://sp.yimg.com/ib/th?id=OIP.1jf3iQTuxlglF-0ZvWo1RQHaLJ&pid=15.1&rs=1&c=1&qlt=95&w=72&h=108" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>In the bottom pic you can see the gas key on the left. It's on the top left sticking out of the bcg.</p></blockquote><p></p>
[QUOTE="dennishoddy, post: 3153567, member: 5412"] When the round leaves the chamber, some of the gas is collected and passes through a drilled port in the barrel. Gas then goes through the gas tube under the handguard back to the gas key which sits on top of the Bolt Carrier Group. The exhaust gasses causes the bolt to cycle to the rear and cycle the action. When the bolt carrier cycles, it disengages the gas tube from the gas key while its cycling. When it cycles back into battery, the gas tube is back inside the gas key waiting on the next charge of gas to cycle the bolt carrier again. I think it's like up to 50,000 psi that comes down the gas tube into the gas key to cycle the bolt. This is what the gas key that is properly staked looks like on a BCG, bolt carrier group. (I'm also including the acronyms that are commonly used by AR builders) [IMG]https://sp.yimg.com/ib/th?id=OIP.UNTWkdrCu-4_vm_pfABkKgHaFj&pid=15.1&rs=1&c=1&qlt=95&w=157&h=118[/IMG] [IMG]https://sp.yimg.com/ib/th?id=OIP.1jf3iQTuxlglF-0ZvWo1RQHaLJ&pid=15.1&rs=1&c=1&qlt=95&w=72&h=108[/IMG] In the bottom pic you can see the gas key on the left. It's on the top left sticking out of the bcg. [/QUOTE]
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