ar15 won't cycle.

Originally Posted By: midwestpredator As far as 5.56/.223, I doubt you will find any appreciable difference in case dimensions to cause feeding issues.

External dimensions of the "2" are one in the same...
 
Originally Posted By: Widow maker 223Is the bolt dragging on the mag at all?

So was working on the rifle tonight. With the bolt closed my 10 round mag is hard to put in. My 30 round pmag clicks right in. Put 10 rounds in the pmag and manually they all cycled through nicely.
 
Okay so went to the range today for a second go around. Still wouldn't cycle. It's getting stuck in the same place. Manually cycled fine.

When I got home I took apart the bcg. The bolt slides into the chamber very easily. So I slide the carrier in without the bolt. Even though I thought I had the gas tube line up properly I definitely did not. The gas tube was putting some pressure on the carrier in about the same position it's getting stuck.

So I aligned the gas block and tube based on where the carrier can slide in and out freely on its own. I got it as best I could but the gas tube and gas key make slight contact as the tube slides in the key. Is this okay? Or should the key and tube not make any contact ar all?
 
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It is now free. No binding or stress. with the carrier in with the bolt removed if I tip the upper the carrier will slide out.

But when I slide it back in you can hear a slight click of the tube and key making slight contact.
 
Originally Posted By: 4seasons69Originally Posted By: pahntr760That should be what you need.

Sounds good. Now I hope the gas ports are still aligned good enough.

That could be an issue. Let us know how it turns out.
 
Will do! I think it will be close. I cleaned the barrel so next time I try shooting it there should be a good mark to check the alignment if it still doesn't cycle

Thanks for all the help so far!
 
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Are you sure the gas tube is in correctly? Like its not upside down in the gas block? I did that one once. Fired like a single shot. I'd say get a 223 chamber brush. Chuck it in a drill and clean the crap out of the chamber with some good lube. Then try again
 
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Here is what i do, take a short length of 3/8 gas hose and put it on the end of the gas tube, now blow through it while turning the gas block a little this way and that way,it's very easy to tell when you find the best spot to tighten your block down.Also make sure the bell on the end of the gas tube is full dia.Originally Posted By: 4seasons69Originally Posted By: pahntr760That should be what you need.

Sounds good. Now I hope the gas ports are still aligned good enough.
 
That is a good idea. I will bring some vacuum hose from work home to test it. I fear if they aren't lined up good enough now I will either need a different gas block and or gas tube
 
It works better than any tool you can buy, marks and measurments only still get you close, but with a bit of fuel line it's easy to find the best spot and you can find leaks by putting a empty case in the chamber, and a finger over the end of barrel, then test air pressure again.Originally Posted By: 4seasons69That is a good idea. I will bring some vacuum hose from work home to test it. I fear if they aren't lined up good enough now I will either need a different gas block and or gas tube
 
So i just want to say thanks for the help so far guys! I went through the gun with a friend. Everything seemed in order to him so we went to the range and it still wouldn't cycle. He thinks it's an issue with the bolt carrier group. Like the bolt doesn't move in the carrier like it should. I'm going to take it into a shop on Monday or Tuesday to see what their thoughts are
 
have you checked that the barrel nut is properly aligned?

if thats off a little bit, dialing in the angle of the gas tube by adjusting the block can cause you to block the gas port.

your gas tube should have no contact with the barrel nut when your gas block is properly aligned with the port. or at least almost no contact - but it should not cause the tube to bend. this is why barrel nut torque is a range, and not a set ft/lbs. take it to the minimum then adjust as necessary to get a gas tube slot on the nut to line up properly with the gas tube hole in the receiver and you're in like flynn.

thats what the top tool in this kit is for. slide it into the receiver and when you can push the rod out of the gas tube port easily and no contact with your gas block you got it right.
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HTH!
 


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