failure to feed/eject on Every round

[big bore 427]

My nephew recently bought an Anderson upper and an asc mag, and was test firing it at my place with wolf ammo, and it would not cycle one round. I told him to try elander mags . Any advice would be helpful. He got the complete upper for $200-220, and I'm thinking it just may be a shoddy build.

[A5BLASTER]

Best thing too do is throw the asc mag in the trash get some cpd mags, then lube the internals soaking wet with a good oil and hand cycle the rifle about 300 times. That will bring in the raceways and smooth everything up.

Does it have adjustable gas?

[big bore 427]

No.

[bj139]

My nephew recently bought an Anderson upper and an asc mag, and was test firing it at my place with wolf ammo, and it would not cycle one round. I told him to try elander mags . Any advice would be helpful. He got the complete upper for $200-220, and I'm thinking it just may be a shoddy build.

What specific problem is it? Failure to feed or failure to eject or other?

[NugginFutz]

Changing the magazine (any 5.56 mag will do, if loaded to 5 or so rounds) can help eliminate the mag as an issue. If the problem persists, then you obviously need to diagnose further.

An upper with a misaligned or undersized gas system can behave in this way, but more information would be useful to help diagnose the problem (upper issue vs. magazine issue).

Does the bolt visibly move or cycle when fired? (No gas)

Are spent cases being ejected? (bolt travel issue / might indicate low gas)

If so, where are they landing (eg. 3 o'clock at 5 feet)? (may help determine under/over gassed)

Does the bolt lock (all the way) back on an empty magazine? (indicates whether or not bolt is traveling sufficiently rearward.)

Are any rounds being stripped from the magazines? (insufficient bolt travel / sticky mag)

Is the bolt riding over the round? (insufficient bolt travel / sticky mag / weak spring)

Is there any difference in behavior from first to last round? (sticky mag / weak spring)

[sundowner]

If you have any magpul 5.56x45 mags try loading only 4 or 5 rounds this should take a mag problem out of the picture .

[big bore 427]

One thing I forgot to mention, I wasn't there at the time, but later the mag would insert fine, but took ALOT of hard rocking to get out, and my SOCOM had the same trouble with his magazine. It's mainly a stovepipe problem which neither of us has ever experienced with 5.56, 300 Bo, or 458 socom.

[sundowner]

It's hitting the front of the mag , There is a thread that shows how to solve that problem .

[Mad Charlie]

It's hitting the front of the mag , There is a thread that shows how to solve that problem .

Mind pointing out that thread?

[sundowner]

Here's a link , the post is on the second page .
http://www.65grendel.com/forum/showthrea...he-grendel

[NugginFutz]

OP - Any word on what you've found, yet?

[poldo]

My nephew recently bought an Anderson upper and an asc mag, and was test firing it at my place with wolf ammo, and it would not cycle one round. I told him to try elander mags . Any advice would be helpful. He got the complete upper for $200-220, and I'm thinking it just may be a shoddy build.

I will tell you what worked for me on my BCA upper and a cheap SS mag with Wolf steel ammo
my issue was double feeding + bolt jamming and failure to extract .. basically the casing would expand and not retract quickly enough to be extracted (brass cools of faster than steel)
magazine would feed one round and lift the other below just enough to lift the first round and miss the feeding ramp..

so this is what worked
#1 makes sure the mag is not too tight in the magwell , pinch the top lips of the magazine .. that worked and fixed the double feeding
make sure the chamber is clean , it might be just as simple as build up

for me honing the chamber did the trick now the steel wolf ammo cycle perfectly , you can buy a honing brush or you can go the cheap way and make a very effective tool with a cut up dowel , sandpaper and 00 steel wool to finish and polish ..
just like this
https://youtu.be/J_owVrx_HQo

the video doesn't show the steel wool part , just take a steel wool pad and pull apart a 4-5" long ribbon , you don't need much
run the drill and let the steel wool wrap around the dowel until you have the desired thickness, add more if you need .. lubricate with your favorite gun lube oil run for a few minutes until the chamber is smooth and shiny.. while at it make sure the gas port is lined up and well secured in place

[big bore 427]

Thanks everybody. We finally found the problem. The gas port drew holes are stripped, not getting enough gas to fully shove the bolt back. Caveat Emptor

[LRRPF52]

If you have any magpul 5.56x45 mags try loading only 4 or 5 rounds this should take a mag problem out of the picture .

That has never worked for me when I've tried it, so I recommend sticking with Grendel mags.

I've had reliable, repeatable results with CProducts and Elanders.

I was at the range with my buddy after completing his 12" Grendel with him, and he had all ASC mags. They were sluggish, didn't lift the cartridge stack all the way up in time, and were really draggy when you depressed the follower and felt how they slid inside the magazine body.

I handed him one of my CProducts mags and it worked fine. He said his ASC mags are working now though for a few hundred rounds he's shot at home.

[LRRPF52]

Thanks everybody. We finally found the problem. The gas port drew holes are stripped, not getting enough gas to fully shove the bolt back. Caveat Emptor

Is there a typo in that post? I'm having a hard time figuring out what you mean, specifically with regard to "gas port drew holes".

[big bore 427]

Sorry. The gas BLOCK threads are stripped. I haven't seen the rifle as he hasn't been here since i started the post.