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Ar15 Gas Tube Hole Up Or Down?


ErikW

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When my upper came back as a single-shot (no gas reaching the carrier) I figured something was wrong with the gas tube. With my new gas tube arriving yesterday, I just drifted out the roll pin and moved the gas block forward. The hole in the tube is facing up. Is that right? It doesn't seem like there can be a gas tunnel at the top of the DPMS gas block, it's just thin aluminum there.

BULL-02.jpg

DPMS gas block. Note hole for gas tube.

The Marine Corps M16A2 manual is no help. I guess stock M16-type guns have a step in the tube so assembly is obvious. My replacement DPMS tube has no such step. (I have a custom upper with an Armalite floating handguard I can't remove, so I can't really tell if the tube in the gun right now has a step.)

Help me out here: hole facing up to the heavens or hole facing down to the barrel?

Edit: Looking as the gas block, the hole in the tube can't possibly face up. It should face down to the gas hole in the barrel.

Edited by Erik Warren
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Well it was a bitch to get out. I had to get it out because it wouldn't rotate. It was a regular step-down tube, in upside down. Don't ask me how that's possible, but there's a nasty kink in it. There's a nice carbon circle on the other side where the hole should have been pointing.

The receiver and barrel nut don't seem to be indexed right. You can see a straight edge (the receiver) blocking the circular hole. The new gas tube only goes in a ways and then hangs up hard. You can see it about a third to a half an inch from where it comes out the receiver to the charging handle. I am SOL now; the thing has to come apart and be re-indexed.

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Put all your parts in a box, head down to Burlingame and see Frank Tabor. He has the tools and the talent to fix you up. He has done AR work for me while I waited (no shjt). Don't tell him I sic'd you on him or he might charge you extra :-)

--

Regards,

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When my upper came back as a single-shot (no gas reaching the carrier) I figured something was wrong with the gas tube. With my new gas tube arriving yesterday, I just drifted out the roll pin and moved the gas block forward. The hole in the tube is facing up. Is that right? It doesn't seem like there can be a gas tunnel at the top of the DPMS gas block, it's just thin aluminum there.

.

Just curious how it got there in the first place? From DPMS?

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