Problems with new ar

JohnnyD · Jan 25, 2015

What's up guy? have a question about my new ar. I traded for it like 6 months ago and never got around to shooting it. Finally got it out today and the rifle won't cycle. When firing the bolt doesn't even come back. When I did got it it had a low pro gas block and I had a gun smith put on a railed high rise gas block. Is the gas tube just unaligned? Best way to check it? It's an Anderson am15

TapRackNGo · Jan 25, 2015

Sounds like gas tube, gas block issue. If you don't know how to work on it, take it to a qualified gunsmith, maybe somewhere that has a range or place to test function.

IronMonster · Jan 25, 2015

yeah, sounds like a gas problem, If the block was just changed I would say its suspect

Capn Jack · Jan 25, 2015

If you've fired it, the scorch marks under the gas block should tell the story. Also, the gas block may have come loose.

Put BLUE Loc-Tite on all of the screw threads.

Buy yourself an AR manual and invest in a few tools. The beauty of the system is, you can do 90% of the work yourself.

JohnnyD · Jan 25, 2015

I figured that was the issue. Any tips for getting it to function?

Capn Jack · Jan 25, 2015

First thing is to verify the gas tube and gas block are properly positioned.

Medic! · Jan 26, 2015

Take a length of aquarium tubing. Push in onto the end of the gas tube in the upper receiver.
Can you blow through it? Is it restricted?

Do the same to the carrier gas block with the bolt removed. Is it blocked or restricted?

Do you have gas rings on the bolt?

JohnnyD · Jan 26, 2015

Well the gas block seemed a little too far forward. Probably be weeks before I get the chance to take it out again but I'll give those a try in the mean time thanks. I do have gas rings on the bolt and the holes are staggered

223to45 · Jan 27, 2015

Sounds like gas block covering hole.

Go back to the low block. Or install a FSB.

JohnnyD · Jan 28, 2015

Low block is already gone. I Changed the block since I won't have a rifle without iron sights. I think I got it now just need to find some time to try it.

JohnnyD · Jan 28, 2015

Kinda pisses me off that I took it to a gun smith to be installed and It was installed wrong though but o well

Capn Jack · Jan 28, 2015

YUP! Know how you feel.

Brother took his into one here and the guy couldn't even trouble
shoot a reversed hammer spring.

That's why it pays to invest in a good book and a few tools. Personally, I found a "Chopstick" with a .223 case over one end handy for bumping take-down pins out.

JohnnyD · Jan 28, 2015

Not a bad idea at all

IheartSig · Jan 28, 2015

Capn Jack said:
YUP! Know how you feel. Brother took his into one here and the guy couldn't even trouble
shoot a reversed hammer spring.

That's why it pays to invest in a good book and a few tools. Personally, I found a "Chopstick" with a .223 case over one end handy for bumping take-down pins out.

Capn Jack, do you have any suggestions for a good book to cover the AR platform and it's mechanisms?

IronMonster · Jan 28, 2015

I do, the whole series of AR books by Patrick Sweeney. I think there are 4 volumes. Read those 4 and there is no way you won't have a better understanding of the AR platforms

IronMonster · Jan 28, 2015

I have all of them on my Kindle, if you are a kindle user I think I can "loan" them

John H · Jan 28, 2015

JohnnyD said:
Kinda pisses me off that I took it to a gun smith to be installed and It was installed wrong though but o well

What did you find??

JohnnyD · Jan 28, 2015

The gas block was too far forward think I got it right now but got to wait till I can get up the mountain or to the range

Capn Jack · Jan 28, 2015

Velzey · Jan 28, 2015

If your taking your firearms to a gunsmith that cannot spot a reversed hammer spring, or a gas block that is out of position...That's really not a gunsmith!