Post by: jrebel on February 16, 2014, 01:46:52 PM
I have probably put 300-400 rounds down the pipe and have maintained it like all the rest of my guns cleaning religiously.
Suggestions??
Thanks
jrebel
Post by: cwuwildcat on February 16, 2014, 02:26:05 PM
Post by: cwuwildcat on February 16, 2014, 02:38:48 PM
http://thearmsguide.com/6827/ar-15-upgrading-extractor-spring/?utm_source=rss&utm_medium=rss&utm_campaign=ar-15-upgrading-extractor-spring&utm_reader=feedly#prettyPhoto (http://thearmsguide.com/6827/ar-15-upgrading-extractor-spring/?utm_source=rss&utm_medium=rss&utm_campaign=ar-15-upgrading-extractor-spring&utm_reader=feedly#prettyPhoto)
Here's a link to the embedded video. AR-15 - Troubleshooting My Pistol/SBR - Part 2 (http://www.youtube.com/watch?v=AsdZToeIMec#ws) Is this similar to your issue? It starts failing about 2 minutes in.
Post by: Biggerhammer on February 16, 2014, 02:39:41 PM
Same ammo the entire time? Have you checked your buffer? Same issue with different mags?
First several questions I would have asked? :yeah:
Is this with factory ammo or handloads? If it's with handloads have you changed your FL die adjustment or dies?
Post by: jrebel on February 16, 2014, 02:52:52 PM
I fired approx 100 rounds at the range with the hornady and it cycled fine. I had my first problems when out coyote hunting in really cold weather. I would go to rack a round in and it would push the round into the chamber but would not seat in the bolt. I tried using the forward assist button and it still would not seat. I had to release the mag and rack the action again (some times a few times) before it would grap the round. At this point it would fire and eject the case but would repeat the above action. I have tried different mags (magpul and steel) and it doesn't seem to matter.
I have not tried my other ammo...which maybe I should.
I have checked the buffer and buffer spring and cannot find anything wrong with it. I have thought maybe a stiffer spring would solve the problem but don't know why all of a sudden what was working just stopped.
I was leaning toward the extractor / bold be faulty???? but again, it worked flawlessly until this started happening.
:dunno:
Post by: Bmcox86 on February 16, 2014, 02:56:26 PM
Post by: Biggerhammer on February 16, 2014, 02:59:23 PM
Post by: FC on February 16, 2014, 03:04:57 PM
Same ammo the entire time? Have you checked your buffer? Same issue with different mags?
First several questions I would have asked? :yeah:
Is this with factory ammo or handloads? If it's with handloads have you changed your FL die adjustment or dies?
I would have asked the same two questions. I had some Aguila that wouldn't chamber in my AR and one round of Brown Bear.
Post by: cwuwildcat on February 16, 2014, 03:08:19 PM
Post by: jrebel on February 16, 2014, 03:12:06 PM
Do you have another BCG that you can swap in, and see if you have the same issues? Regarding the buffer, I think the issue would be with the weight of the buffer, not the spring strength.
I don't, I was going to swap bold carrier groups with a buddy and see what happens as a trouble shooting method, but have not gotten to it yet. I could do the same with the buffer.
Have you checked the headspace?
I haven't....I bought the upper as a complete upper. I am not sure I even know how to check the head space as this is my first AR ever.
You mentioned cold weather. Are you shooting it fairly wet? Is the cold weather reacting with your lube and causing a"Sticky" effect. Slowing the bolt carrier group. I've seen that happen. Can you take a small crew driver tip and move your extractor on your bolt in and out or is it jammed?
I am not running it very wet at all as all the literature I have looked at said not to. The extractor moves fairly easily. I took the bolt completely apart and cleaned the extractor and did a function test on a piece of brass. It seams to be working well when not in the gun.
I will take a picture of the brass and bullet marks...maybe that will help.
Post by: cwuwildcat on February 16, 2014, 03:23:33 PM
http://www.gundigest.com/guns/rifle-reviews-articles/gunsmithing-the-ar-3-tips-for-buffers-recoil-springs (http://www.gundigest.com/guns/rifle-reviews-articles/gunsmithing-the-ar-3-tips-for-buffers-recoil-springs)
Post by: jrebel on February 16, 2014, 03:34:10 PM
With all this being said the gun shoots lights out....best group was three shots that could be covered by a dime at 100 yards off a bench.
Post by: Biggerhammer on February 16, 2014, 03:46:46 PM
Post by: snowpack on February 16, 2014, 03:52:01 PM
Post by: Heredoggydoggy on February 16, 2014, 04:52:22 PM
Post by: mountainman on February 16, 2014, 07:23:38 PM
Post by: Fl0und3rz on February 16, 2014, 08:04:01 PM
Post by: mrolen on February 16, 2014, 08:39:58 PM
Post by: Heredoggydoggy on February 16, 2014, 08:52:37 PM
I would start by full strip and clean of the bolt. some lube is to heavy in cold weather I have experienced this with frog lube. Try a different mag and possibly a new BCG, that is where i start with an ar with problems.
:yeah: I'd suspect a lube problem. We've had some very cold temperatures lately, and some lubes don't handle cold very well! :tup:
Post by: snowpack on February 16, 2014, 09:09:12 PM
Post by: jrebel on February 16, 2014, 09:43:51 PM
For the diagnostic purposes I will try one thing and shoot, then try another and so on....I will update with the progress. I hope I can figure this out. I will say this...as much as I have enjoyed building and shooting my AR, I have never has a problem with my AK. This AR thing can be frustrating. :bash:
Post by: 6.8mmARHunter on February 16, 2014, 10:48:47 PM
You have to swear off the 49ers. Everything will be good after that.
Totally kidding...
I've got nothing else.
Post by: jrebel on February 22, 2014, 10:46:25 PM
When a bullet looked like that. It's either the mag isn't seating correctly or for some reason the bullet is riding the front of a metal mag when it's feeding either that or it's a feed ramp issue as in m4 cuts on the receiver but not on the barrel????? Hmmmmmmmm. Look into the feed ramp area and see if it is a smooth transition from the M4 cuts in the receiver to the cuts in the barrel.
OK...Well after a lot of tinkering and a few upgrades, I think I know what the problem is. My bullets and cases are being scared by the lugs on my m4 feed ramps. Next step will be to polish (find someone that knows how to polish) feed ramps and clean up the ramps where they meet the lugs. My set up is a rifle upper with m4 ramp barrel extension. My magpul magazines seat the bullets high enough that the bullet is not coming into contact with the receiver at all. The copper and brass scaring is coming from the harsh angles at the ramp / lug area of the barrel extension.
If I am right....this should fix all my problems. I will post after I have had the ramps polished.
jrebel
Post by: Biggerhammer on February 22, 2014, 11:45:20 PM
Post by: jrebel on March 04, 2014, 01:49:08 PM
Last week I spent a couple hours watching youtube videos and learning how to polish ramps and work on AR's. Today I took the dremel and got to work (figured the worst I was going to do is mess up a barrel extension and maybe an upper) :chuckle: :chuckle:. Spent a couple hours polishing the feed ramps. Now they look really shine and are awfully pretty. I readdressed the bolt and bolt carrier; recleaning and oiling the living piss out of it. Everything was smooth as butter. Next step was to feed ammo and see what happens. I place a loaded mag in the well (pointing my muzzle toward the floor) and feed a round................JAM :bash: :bash: :bash: :bash: :bash: :bash:!! Try again.........JAM :bash: :bash: :bash:!! Now I am pissed. Inspect the brass and notice the makings on the bullet and brass are significantly better / lighter. The brass on the head stamp is still marked up pretty well. So needless to say I am now really pissed off.
I decide to just buy a new bolt carrier group. Drive to one of my new favorite stores (Stans Merry Mart) and purchase a nickle boron bolt carrier group. Come home and replace the original bolt carier group. Guess what......Cycled a complete mag with no issues. Bullets still have very minor markings but all in all everything looks good. Head stamp has no marks. Problem solved....for some reason my bolt / extractor has gone bad. Now to replace the extractor on the old bolt and see what happens. If that does not solve the problem I will buy a new bolt. If that does not fix the problem I will sell the complete pile of mess to the highest bidder!! :chuckle: :chuckle:
jrebel
Post by: Fl0und3rz on March 04, 2014, 01:54:58 PM
Post by: jay.sharkbait on March 04, 2014, 02:11:21 PM
Update....Problem solved!!!!
Last week I spent a couple hours watching youtube videos and learning how to polish ramps and work on AR's. Today I took the dremel and got to work (figured the worst I was going to do is mess up a barrel extension and maybe an upper) :chuckle: :chuckle:. Spent a couple hours polishing the feed ramps. Now they look really shine and are awfully pretty. I readdressed the bolt and bolt carrier; recleaning and oiling the living piss out of it. Everything was smooth as butter. Next step was to feed ammo and see what happens. I place a loaded mag in the well (pointing my muzzle toward the floor) and feed a round................JAM :bash: :bash: :bash: :bash: :bash: :bash:!! Try again.........JAM :bash: :bash: :bash:!! Now I am pissed. Inspect the brass and notice the makings on the bullet and brass are significantly better / lighter. The brass on the head stamp is still marked up pretty well. So needless to say I am now really pissed off.
I decide to just buy a new bolt carrier group. Drive to one of my new favorite stores (Stans Merry Mart) and purchase a nickle boron bolt carrier group. Come home and replace the original bolt carier group. Guess what......Cycled a complete mag with no issues. Bullets still have very minor markings but all in all everything looks good. Head stamp has no marks. Problem solved....for some reason my bolt / extractor has gone bad. Now to replace the extractor on the old bolt and see what happens. If that does not solve the problem I will buy a new bolt. If that does not fix the problem I will sell the complete pile of mess to the highest bidder!! :chuckle: :chuckle:
jrebel
When you cycled the rounds this last time were they rounds that had been previously "tested" in the rifle?
Post by: jrebel on March 04, 2014, 02:55:01 PM
Update....Problem solved!!!!
Last week I spent a couple hours watching youtube videos and learning how to polish ramps and work on AR's. Today I took the dremel and got to work (figured the worst I was going to do is mess up a barrel extension and maybe an upper) :chuckle: :chuckle:. Spent a couple hours polishing the feed ramps. Now they look really shine and are awfully pretty. I readdressed the bolt and bolt carrier; recleaning and oiling the living piss out of it. Everything was smooth as butter. Next step was to feed ammo and see what happens. I place a loaded mag in the well (pointing my muzzle toward the floor) and feed a round................JAM :bash: :bash: :bash: :bash: :bash: :bash:!! Try again.........JAM :bash: :bash: :bash:!! Now I am pissed. Inspect the brass and notice the makings on the bullet and brass are significantly better / lighter. The brass on the head stamp is still marked up pretty well. So needless to say I am now really pissed off.
I decide to just buy a new bolt carrier group. Drive to one of my new favorite stores (Stans Merry Mart) and purchase a nickle boron bolt carrier group. Come home and replace the original bolt carier group. Guess what......Cycled a complete mag with no issues. Bullets still have very minor markings but all in all everything looks good. Head stamp has no marks. Problem solved....for some reason my bolt / extractor has gone bad. Now to replace the extractor on the old bolt and see what happens. If that does not solve the problem I will buy a new bolt. If that does not fix the problem I will sell the complete pile of mess to the highest bidder!! :chuckle: :chuckle:
jrebel
When you cycled the rounds this last time were they rounds that had been previously "tested" in the rifle?
Same manufacturer and same ammo, but batch..... (if that makes sense). The other stuff that was jamming up has some horrible damage to the brass on the head stamp. I am not to sure it will feed in anything at this point...it may need to be trashed.
Anyone else ever have a bolt / extractor just go bad??? Worked great for the first 3-400 rounds.