First time shooting, FTF all day.

[Powerman]

If you have a magpul stock other then the PRS

http://www.rainierarms.com/?page=shop/detail&product_id=3542

Thanks, that's really nice. But for $170, I could just buy the PRS. :)

 

With the charging handle and what not, I have a few ideas, and I do not want it looking getto. Something removable. I do not need a lot... like 1/4"-1/2" tops. Magpul has a riser, but not for the ASC-L which is what I have. LaRue Tactical makes a nice one, but I have not got confirmation it will fit on a ASC-L... my guess no. All the riser stuff out there is made a for a MOE to fit in the slots that come on that stock.

[Powerman]

Hey guys, so the saga continues. I can't get reliable runs of more than a 100 give or take, and the same thing. I'll get a short cycle, I'll lube it up and it will run for another 2-3 mags and same thing. I keep thinking I am not using enough lube, but it just does not seem right that it won't run right. I started another thread that I kind of messed up asking for conflicting things. But I did get some good suggestions, and I need to start from square one and go from there. Here was the plan:

 

I got plenty of good advice from everyone. I'll use it next time up. I'll number my mags. I'm going to use a couple of the new Pmags I have... just because they will be from a different lot. I'll just shoot small groups and get more fail to lock back. I am going to clean up my buffer tube and measure again it's 7 5/8". But I can move the bolt back another 1/4" past the bolt lock. I'm going to run some Mobil 1 since that seems prudent. And check my brass when it does happen. I'm going to take a look and get some picks when it does jam to maybe see what's going on. Just start from the begining. I do not think it is unreasonable to run more than a 100 rounds before it jams.

 

So... I just decided to go back to this thread since it had some history and info in it. Bad thing is I have had zero time to get back to the rifle. But I do want to go shoot soon. And I will take it a step at a time.

 

QUESTIONS. It still has not been cleaned from last outing... about 150-200 rounds maybe, and it was acting up. I am tempted to NOT clean it and just pick up where I left off. Is that a good idea?

 

If I do clean it, I am going to get out the drill and chamber brush and go to town. I want to take off the gas block and see what it looks like with that being a past problem. I was going to clean the buffer tube and see what it looks like. Is there anything else I should take a look at while doing that?

 

How do you know if your rifle is properly gassed?

 

I really do appriciate any help, and I have my bunchless panties on so I should be good to go. :))

[Robocop1051]

1. Think about storing your rifle muzzle down. Oil follows gravity and too much oil will eventually end up in your buffer tube, along with all the carbon and junk that comes with it. The muzzle device will protect your crown from damage.

2. Don't take off the gas block unless it looks like it is on incorrectly. The gas block will build a seal from the carbon, making it nearly air tight. That's a good thing!

3. You can artificially wear in your parts as well. Get some 0000 steel wool and oil, then work over the BCG and upper receiver. It won't take off any material, but will smooth out any roughness.

4. Chuck a chamber brush into a hand drill, lube it up real good, and run it high speed in the chamber for a bit. You'll chew your brush all to shiit, but that's replaced for less than $5. It should polish everything up real nice.

I don't suggest using any polishing compounds. They speed things up, but they're also acidic and extremely difficult to completely remove when you're done.

How do I know if it's properly gassed? Shells eject at the 3 to 4 o'clock, into a neat and tidy pile, about 3 feet off my right hip... and the bolt automatically locks on an empty mag.

[Powerman]

Thanks a bunch Robo.

 

1. I store my rifle horizontal so at least things are running down.

 

2. Yet with several hundred rounds through the new block, it still is not sealed. I still have fouling at the front and back of the new PRI block. There is a bit around the tube too, but most is from barrel/block seam.

 

3. Hu, good point. I have been doing some trigger work on my HKs and polishing things up... didn't really think about it.

 

4. Will do. One chamber brush down the drain.

 

Ya, no compound.

 

Shells are at 4:00 a good 6 feet away. But they do land on concrete, so they may bounce/roll a bit. And the bolt always locks back on empty mag... until it doesn't. :))

[Powerman]

UPDATE: So I finally got a little bit of time.

 

I soaked my barrel and chamber in solvent. Chucked up a chamber brush in my drill and went to town.

I cleaned my buffer tube and components. Tube measures 7 5/8... more like 7 11/16. But it isn't short.

I lubed everything up with Mobil 1 syn 5/30. That tasted good. :)

 

Went to the range. Loaded up 4 mags with one being new from new lot. Those mags are now numbered. I did do a few single rounds to check lock on empty... it did. Used the rest of my CBC NATO to not "waste" my other stuff getting to a malfunction. Shot 4 mags FAST because I did not have much range time. Just ran it on 150 yard steel. That was fun.  Everything ran great. Brass was consistently 2-3 feet behind me, and 4-5 feet across from me. 4 o'clock. 4-5 feet. Bolt locked on empty all 4 mags.

 

Loaded next mag... first round in mag failed to eject. Malfunction on first round fired. I then loaded singles and still bolt locked back... then loaded a couple more mags without any malfunctions. That was all the time I had. 120 rounds, malfunction on 81.

 

 

 

 

 

I have the brass from the malfunction. It was dented, but now I see as someone said it was because of the lugs of the barrel. Thanks. After the malfunction, I watched my brass... gun was pointed down range :) .... and it was still ejecting same place with singles.

 

So.... I used up my CBC, and from here I have American Eagle and will probably pick up some Federal NATO. But in the past AE did it, and so did Federal SMK.

 

I can take pics of my rifle right now. In the past lube has been a question, but it was running wet and still is.

My next move was going to be not to clean it, and get back to the range with the same gun and see if I continue to get hang ups as I have in the past. It sucks going through a hundred rounds to get to a malfunction... but after about a 100... they happen with much higher frequency.

 

 

Any ideas, thought, or suggestions for my next move?

Edited January 2, 2014 by Powerman

[bubbasks]

BCM upgrade extractor spring kit. Best 4 bucks ever. All my double feeds went away

[Powerman]

BCM upgrade extractor spring kit. Best 4 bucks ever. All my double feeds went away

 

My bolt is a JP bolt new... well now it's not "new". I have not taken apart my bolt. Some said it was not needed because JP usually does not have problems. But obviously it is possible.

 

In the past I do think I was not using enough lube.... but now it seems like an ejection problem and not a short cycle problem.

[bubbasks]

I too am using the jp bolt. Still needed it

[bubbasks]

The jp spring is shorter and stiff compaired to bcm but the bcm has the plunger and oring that really made it work good. Havent had a single issue since. Usta be 1-2 a mag now none in 300 rnds. Same oiling procedure i used b4 so nothing changed but the spring kit

[Powerman]

The jp spring is shorter and stiff compaired to bcm but the bcm has the plunger and oring that really made it work good. Havent had a single issue since. Usta be 1-2 a mag now none in 300 rnds. Same oiling procedure i used b4 so nothing changed but the spring kit

 OK. Not all would need it... but some may?

 

So is this what you are talking about? Meaning is the AR15 good, or is there another .308 version. I did not see one. For the money what can it harm?

 

http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm

[bubbasks]

Thats it. I got the 3 pack just bc shipping was 9 bucks. Idk why some work fine and others dont but that kit has solved most peoples problems. With it on that extracror is a stiff sum bitch.

[Powerman]

Great, now I get the joy of taking my bolt apart. Was hoping not to learn that fun job for a while. :)

[bubbasks]

Its a piece of cake. Pin and bolt is out. 1 pin and ur extractor is out. Replace spring and reverse

[Powerman]

So then could you sort of explain what is going on?

 

And just so I am speaking accurately... is that what it is, a "double feed"?

 

Thanks.

Edited January 3, 2014 by Powerman

[98Z5V]

Double feeds are two live rounds trying to get into the chamber at the same time - that comes from jacked up feed lips on a magazine, or an over-powered spring in the magazine. 

 

Double feeds are mag related. 

 

Double feeds are not bolt related, gas system related, buffer spring related, etc.

[bubbasks]

Also like mine is the spent round being partially ejected and as the bolt comes forward it feeds the rd from the mag right into it. Mine happened alot on last round so mag would lock back and spent rd sitting ontop of the mag

[bubbasks]

If its 2 live rounds its mag related. If its spent empty casing and live rd it is extractor related.

[Powerman]

Spent round on top of live round.

If its 2 live rounds its mag related. If its spent empty casing and live rd it is extractor related.

[bubbasks]

Yep. What happens is the extractor pulls the round from the chamber but slips as the neck goes over the lugs and releases it. Bolt cycles and feeds new round jamming it up and into spent round. The new spring/plunger/oting makes sure it doesn't slip off the head. You should see less extractor scratches on ur brass. If it doesnt work ill buy the spring kit from u haha can always use spares. Their shipping was great when i ordered. Shipped same day priority usps and at my place 2 days later

[Powerman]

The ejector made a few marks on the brass. I was looking at it after I pulled it out. It is like the casing rotates a bit and the ejector makes a few marks. A lot of my brass looks like that. I have n idea if that is normal or if I should just see one round mark. I have noticed some marks from the extractor, but just figured that was normal from chambering.

 

Any particular reason it takes 4-5 mags to cause it other than it just getting dirty/hot?

Edited January 3, 2014 by Powerman

[survivalshop]

The marks on the brass sound normal , after all , fired brass was & is , not meant to be reloaded . 

 The bolt should be completely disassembled & all components should be inspected , function tested & or upgraded if need be . ( ejector/spring , extractor/spring , gas rings  )

Carrier gas key should also be inspected for leaks or loose mounting screws.  

[Powerman]

Ya, I already ordered the extractor springs. Seems most complain about the ejector... but ya, doesn't seem too difficult. It's due for a cleaning so I will take it all apart and see how it looks.

[Powerman]

Well I have never taken my bolt apart before so that was the last mystery. Ya, the extractor was easy, and the ejector was kind of a PITA. The ejector was clean, and so was the hole. there was a lot of shavings in the bolt.... some. There was some shavings on the pad of the ejector. Not sure if it acted like shim and kept the plate from grabbing good. Well anyway, got it all cleaned out good as new. Installed the BCM kit, and it's good to go.

 

The bolt was pretty easy to clean. Not much grime with all the lube  have been running. MilPro7. I will say though that I like the Mobile 1. How could you not as cheap as it is. But last outing I ran it wet and it was a breeze to clean up. I don't have to keep running it wet, but it was nice. I do think this is going to solve my problem. I'm going to order a big box of Federal AE 7.62 and go have fun when the weather cooperates. Obviously I will update when I do.

[Powerman]

Errrr... So, went to day and it was beautiful. Had the last box of 50 CBC. 100 rounds of ZQ1, and 40 of PMS. I had a box of AE, and FGMM 168.

 

Third mag in double feed. AE. Then a couple more mags a stove pipe. That was CBC. I had a few more. By the last mag or two, I was having double feeds quite frequently. But those last two mags were PMC and ZQ1. No single mag was doing it. At least 3 different ones. Not sure if one of them was a new one. All together I got through about 180 rounds, and about 10 double feeds. Bras continued to be placed consistently throughout.

 

I got home and took it down. Everything was still wet... but I didn't soak it this time. Rings were dry of course. I did not add any lube at the range. I took the ejector apart, but it all looked good. No fouling or shavings, spring and o-ring good. Nothing in the claw. Ejector moved freely. Bolt was still good with lube.

 

At this point I'm pretty bummed. I really thought I had the right fix. This is unacceptable. Double feeds are the worst to clear. As it is, my rifle is not reliable. I did have time thought o finally get some good groups in. Nothing to brag about, but I was at least MOA. I even got some time prone and did much better. Got out to 1000 yards to on steel and it was hitting well. Now I at least have a place to start from and get better.

 

3 shots at 100 FGMM 168

 

 

6 shots. I was nice and tight until the end. From a bench

 

 

 

 

 

 

 

 

 

 

All the above are all different jams. What now?

[bubbasks]

How are the claw marks on ur brass from the extractor. Any tearing of the rim?