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9/22/2017 12:11:25 AM
Posted: 9/4/2005 5:16:15 PM EDT
Any website that I can find info explains how the AR gas system works. Thanks.
Link Posted: 9/4/2005 5:24:30 PM EDT
Let me give it a shot.

You shoot your round. The round expels gas as it leaves the barrel. Some of the gas is pushed through the gas tube. The gas that was in the tube pushes the bolt back to chamber another round (all in the upper receiver).

Link Posted: 9/4/2005 7:57:39 PM EDT
I know all that, I'm not sure which part in the upper rceiver reacts with the gas. I don't have an AR yet, looking at the part diagram, I don't see anything like a piston to take the gas and push the bolt back. How is the gas sealed in the upper receiver? I guess when I have my AR, it may become clear, but I just want to understand more, so I know what to look for in case something go wrong on the new rifle. Thanks.
Link Posted: 9/4/2005 8:12:38 PM EDT
[Last Edit: 9/4/2005 8:13:03 PM EDT by WIZZO_ARAKM14]
The gas is routed directly into the Bolt/carrier assembly. It pressurizes what you would call a chamber in there behind the gas rings. When this happens, the gas pressure pushes the carrier rearward, unlocking the bolt, and venting the excess gas out of the gas ports on the side of the carrier.

Hope this clears it up a little.

Link Posted: 9/4/2005 8:32:18 PM EDT
[Last Edit: 9/4/2005 8:32:44 PM EDT by cda24]
The gas travels through a gas tube. The tube starts at the gas block (where the front sight is) and is hidden under the handguards. It extends into the upper receiver. There is a snorkel (for lack of a better term) on top of the bolt carrier. The gas moves into the snorkel to propel the bolt carrier assembly rearward.
Link Posted: 9/4/2005 8:44:12 PM EDT
Is carrier key (like a feed tube?) the mating part to take the gas from the gas tube and pass the gas into a chamber (in bolt carrier?) behind bolt and the bolt rings seal the gas chamber? When the chamber pressurized, it drive the carrier back and unlock the bolt. When the bolt unlocked, the gas pressure in the barrel acts like a blow back system, continue to push the bolt/carrier assembly back. I am just guessing by reading the part diagram.

Link Posted: 9/4/2005 9:21:49 PM EDT
Link Posted: 9/6/2005 2:55:40 PM EDT

Originally Posted By ar15_rifleman:

GREAT resourse, rifleman... everyone should read this who can't REALLY explain how there rifle works...
btw, got to love question 8 in the final exam at the VERY bottom of the page, lol
Link Posted: 9/6/2005 5:22:50 PM EDT
LOL hmm, would have to go with the shotgun, my best friend caint shoot worth a shit.
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