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Page AR-15 » Troubleshooting
AR Sponsor: bravocompany
Posted: 6/19/2011 4:56:32 PM EDT
Here it is.

My custom built girl has hit 4k problem free rounds EXCEPT for the past 500 or so.
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0474.jpg
Heres what I have: Defensive Edge CY6 lower- Tapco stock- Failzero bcg+hammer-Double star upper 16"-VLTOR casv free float-Eotech553 tan w/ 3x fts magnifier.

She's a frankenstein but who cares...

MY TROUBLES ARE>>>>>

––I have experienced multiple failures to lock back on last round.
––probably 1 in every 30 rds I get an over/under jam. (Bolt catches just before the rear of the round and jams it between the ramps and bolt lugs––-dont know what to call it)
––Also the front of my ejection port is experiencing LOTS of contact with the ejected brass...Ill try to show in pics http://imageshack.us/photo/my-images/191/dsc0400ga.jpg/
––Lots of gas residue underneath the top half of my free float rail. Please view and say whether this is normal after 4k rnds
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0374.jpg

WHAT I HAVE DONE>>>>

––disassembled, cleaned, and checked alignment of whole gas system including barrel port. TWICE
––ensured free movement of buffer spring in tube (made sure the thing didnt have any junk stopping it) http://imageshack.us/photo/my-images/577/dsc0384ln.jpg/
––experienced problems in ALL of the following. Tacticalammunition.com 55gr fmj reloads. Hornady match 52gr hpbt. American Eagle whatever that black box is 55gr fmj stuff
––even cut 2 revolutions off of the buffer spring in a desperate field-expedient attempt to remedy the prob

pls dont say "just shoot heavier" rounds. But still HELP!
Link Posted: 6/19/2011 5:06:41 PM EDT
[#1]
Replace the mutilated buffer spring.
What mags. are you using/
Link Posted: 6/19/2011 5:56:35 PM EDT
[#2]
Pmags AND GI.

Both I have cleaned to remove problematic variables, I also experience problems with both

Also. I will be replacing the buffer AND spring. I don't like the way it looks.... give me an opinion on this pic
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0428.jpg
Link Posted: 6/19/2011 6:14:44 PM EDT
[#3]
If you are getting that much gas past the gas-block something is pluged. I would pull off the gas block check the gas tube and also the gas port in the barrel they can get pluged. If the port looks pluged take a drill bit THE SAME SIZE and by hand run it down the port hole. After that clean the barrle with a foam cleaner and make sure it comes out the gas port. You will have to get a new buffer spring after you put it back together. You might want to get a new gas tube just to be safe. Hope this helps.
Link Posted: 6/19/2011 6:16:27 PM EDT
[#4]
PMAGS are the best to use!
Link Posted: 6/19/2011 6:20:53 PM EDT
[#5]
Ok, Heres a pic (U might have to right click)

http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0373.jpg

And it is clear as a whiste, and of course u can see where the front sight port is correctly centered around it


Link Posted: 6/19/2011 6:26:04 PM EDT
[#6]
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0378.jpg

I cleaned it out and tested the flow many times. Might still replace it but its clean inside
Link Posted: 6/19/2011 6:26:24 PM EDT
[#7]
Link Posted: 6/19/2011 6:29:49 PM EDT
[#8]
Thnk u... Good info

But look at this... I mean doesnt this show that the front sight is aligned with the por?t (The large circle outside the port)
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0373.jpg
Link Posted: 6/19/2011 6:32:22 PM EDT
[#9]
OK.. Solutions so far...

––Replace buffer + spring
––replace front sight post with a better adj, gas block?

how about these?
Link Posted: 6/19/2011 6:33:04 PM EDT
[#10]
Seeing the pictures, I would change the gas block all together and you need a new gas tube!! A new good name buffer and spring would be a great idea also!
Link Posted: 6/19/2011 6:34:32 PM EDT
[#11]
That would be a very good place to start. It should fix your problem.
Link Posted: 6/19/2011 6:38:35 PM EDT
[#12]
The thing that gets me is Double Star puts good stuff??? It must just be the gas block out of size, the ID (inside diameter) i mean.
Link Posted: 6/19/2011 6:39:37 PM EDT
[#13]
Thank you all!

Ok will do asap. any recommended front gas block?
Link Posted: 6/19/2011 6:41:17 PM EDT
[#14]
Yup!

The whole upper was bought factory assembled (of course except VLTOR CASV)

But if the ID was off, then why would I have 3.5k rounds through it with no prob?
Link Posted: 6/19/2011 6:55:06 PM EDT
[#15]
That is a very good point that I cant answer. I just pulled apart my grandfathers last week and it was a Bushmaster match and it was doing the same thing at 2300rds. I put it in the milling maching and drilled out the by .002" and it runs like a champ. I did put a troy low-pro gas block it. I think they are the one of the best.
Link Posted: 6/19/2011 7:00:26 PM EDT
[#16]
Ok thank you.

I'm thinking of YHM flip front sight/ gas block due to it's probable matching with my casv

BUT do u think I could fit (with some minor milling) a piston kit under this free float?
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0386.jpg



Link Posted: 6/19/2011 7:03:16 PM EDT
[#17]
Sure that would work just fine. They are tightened by set screws, that will help you get it as tight as needed!
Link Posted: 6/19/2011 7:04:24 PM EDT
[#18]
what type of piston kit do you have in mind?
Link Posted: 6/19/2011 7:05:25 PM EDT
[#19]
Adams Arms...  

cuz i doubt that the osprey OPS416 will fit
Link Posted: 6/19/2011 7:08:36 PM EDT
[#20]
We have used Adams Arms piston kits and they sure work!! It looks like it might but it will take some work! YHM now makes a rail that is for the piston Kits.
Link Posted: 6/20/2011 10:06:43 AM EDT
[#21]
K, Thank you.

ALSO along with the short stroking I have this problem...
http://i1115.photobucket.com/albums/k555/td_symmons/IMG_0274.jpg
http://i1115.photobucket.com/albums/k555/td_symmons/DSC_0400.jpg

OK, am I correct in that replacing the ejector / ejector spring will fix this failure to eject and forward ejection problem?

Link Posted: 6/20/2011 12:32:55 PM EDT
[#22]
Link Posted: 6/20/2011 1:19:53 PM EDT
[#23]
Ok, just checked it and the bolt face is dead on with the rear end of the ejection port when I have the charging handle all the way back.
Link Posted: 6/20/2011 3:50:03 PM EDT
[#24]
Easy fix if your gun has been working properly all this time. It's called a double feed if theres two lives rnds trying load at once (due to magazine problem, mostly on poly mags) and its called a failure to extract if the empty case is still in the chamber while a live rnd is trying to enter the chamber usually due to short stroke. And a yes, replace the ejector spring and ejector roll pin. you don't have to replace the ejector, but it wont hurt to do so. should replace the extractor spring, extractor insert (use a black one) and CAR buffer spring (must be 11.6"). You should measure the gas port with a caliper. If it's bigger than 0.077", then its too big. Gas ports will open up a bit  after amounts of rnds, then it will short stroke. Then you'll need a tougher buffer spring and heavier buffer. Springco sells the red CAR buffer spring and hard extractor spring combo for around 21.50 the last time I checked. Don't worry, you'll get it fixed and running again. Sometimes it's good to have problems, that way you weed out the cheaply made parts for quality parts that will last longest.
Link Posted: 6/20/2011 7:33:27 PM EDT
[#25]
Link Posted: 6/21/2011 8:28:43 AM EDT
[#26]
Quoted:
Easy fix if your gun has been working properly all this time. It's called a double feed if theres two lives rnds trying load at once (due to magazine problem, mostly on poly mags) and its called a failure to extract if the empty case is still in the chamber while a live rnd is trying to enter the chamber usually due to short stroke. And a yes, replace the ejector spring and ejector roll pin. you don't have to replace the ejector, but it wont hurt to do so. should replace the extractor spring, extractor insert (use a black one) and CAR buffer spring (must be 11.6"). You should measure the gas port with a caliper. If it's bigger than 0.077", then its too big. Gas ports will open up a bit  after amounts of rnds, then it will short stroke. Then you'll need a tougher buffer spring and heavier buffer. Springco sells the red CAR buffer spring and hard extractor spring combo for around 21.50 the last time I checked. Don't worry, you'll get it fixed and running again. Sometimes it's good to have problems, that way you weed out the cheaply made parts for quality parts that will last longest.


Ok thank you sir.... I forgot to mention that I did have a COMPLETE failure to eject..... I will give you a video link in just a bit when i finished uploading it.

OK here it is http://s1115.photobucket.com/albums/k555/td_symmons/?action=view¤t=Ejectionandfeedproblems.mp4
Link Posted: 6/21/2011 8:34:55 AM EDT
[#27]
Quoted:
Quoted:
Ok, just checked it and the bolt face is dead on with the rear end of the ejection port when I have the charging handle all the way back.


Need to shorten the stock tube so it can be spun in a few more turns to both index the butt stock and kiss the center of the buffer retaining pin, or just drop a Fender washer or two (just a hair smaller OD that the tube ID) down the tube before installing the recoils as a band aid to correct that problem.

With the bolt face coming all the way back to the back of port, you can see on the receiver where the brass is being bounced off the back of ejection port/very start edge of the deflector out the port, and why the cases are being bounce off such back into either the action or into the front edge of the ejection port.


OK, thank you. But doing that wont help the original problem... which was the short stroke. But I'll wait until I've made the appropriate remedies for the short stroking, then Ill do exactly what u said if its still spitting them out the same way.
Link Posted: 6/21/2011 11:08:42 AM EDT
[#28]
Quoted:
Quoted:
Easy fix if your gun has been working properly all this time. It's called a double feed if theres two lives rnds trying load at once (due to magazine problem, mostly on poly mags) and its called a failure to extract if the empty case is still in the chamber while a live rnd is trying to enter the chamber usually due to short stroke. And a yes, replace the ejector spring and ejector roll pin. you don't have to replace the ejector, but it wont hurt to do so. should replace the extractor spring, extractor insert (use a black one) and CAR buffer spring (must be 11.6"). You should measure the gas port with a caliper. If it's bigger than 0.077", then its too big. Gas ports will open up a bit  after amounts of rnds, then it will short stroke. Then you'll need a tougher buffer spring and heavier buffer. Springco sells the red CAR buffer spring and hard extractor spring combo for around 21.50 the last time I checked. Don't worry, you'll get it fixed and running again. Sometimes it's good to have problems, that way you weed out the cheaply made parts for quality parts that will last longest.


Ok thank you sir.... I forgot to mention that I did have a COMPLETE failure to eject..... I will give you a video link in just a bit when i finished uploading it.

OK here it is http://s1115.photobucket.com/albums/k555/td_symmons/?action=view¤t=Ejectionandfeedproblems.mp4


It would be a good idea to stop resting the rifle on the mag when shooting it ... that can cause feed and extraction issues.
Link Posted: 6/21/2011 12:57:19 PM EDT
[#29]
Understood.....

Heres another vid then....just for u

It has a Jam and failure to lock the bolt back on the last round.

http://s1115.photobucket.com/albums/k555/td_symmons/?action=view¤t=Justforyou.mp4

Link Posted: 6/22/2011 7:49:53 AM EDT
[#30]
Quoted:
Understood.....

Heres another vid then....just for u

It has a Jam and failure to lock the bolt back on the last round.

http://s1115.photobucket.com/albums/k555/td_symmons/?action=view¤t=Justforyou.mp4



I see a failure to feed but no extraction problems there ... that is 95% of the time a mag related issue ... try tearing them down, cleaning and lubing them.

By the way .... what is your trigger finger doing?
Link Posted: 6/22/2011 8:19:50 AM EDT
[#31]
My index finger is partially paralyzed, and if I was trying to shoot right I might have shouldered the weapon too.

The first vid was my nephew shooting. I never rest the weapon on the mag and I still have the failures listed, but I will ensure that the rifle isn't rested on the mags again by others.

1) short stroke
2) failed/weak ejection
3) The original jam that was stated on the first post.

2 of those problems were in the recent video.

I have disassembled and thoroughly cleaned all of my mags which was also previously stated.


Link Posted: 6/22/2011 8:26:09 AM EDT
[#32]
Quoted:
My index finger is partially paralyzed, and if I was trying to shoot right I might have shouldered the weapon too.

Lets establish.

The first vid was my nephew shooting. I never rest the weapon on the mag and I still have the failures listed.

1) short stroke
2) failed/weak ejection
3) The original jam that was stated on the first post.

2 of those problems were in the recent video.

I have disassembled and thoroughly cleaned all of my mags which was also previously stated.


Don't take it personal .... I was just asking a simple question.

It seemed peculiar where it was first positioned and where it ended up .... hope you figure it out, have fun with your rifle.
Link Posted: 6/22/2011 8:28:44 AM EDT
[#33]
Yessir, no probs.

But usually I hear that resting on the mag only causes the bolt not locking back (in previous vid) and other bolt cycling problems, yet i still had them just then?

Also, the reason Im not to picky about people resting on the mag is because I hear that its a commonly used competition technique. "Monopoding" "Canadian prone" and Im sure theres other names for it.

BUT I wont let it happen any more.
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