AR Sponsor
Posted: 6/7/2009 5:07:07 AM EDT
|
Ok here's what I got. I have a 14.5 M4 uppper that has about 300-400 rounds through it, I believe, so it's still fairly new. Anyways I started this thread a month ago or so Old Thread
The problem I am still having is that the bolt is picking up the fired case and pulling it back but it is not ejecting. The round is maybe a quater of the way out of the chamber, almost to the point of a stove pipe, but just short of it. The round is being picked up by the bolt but not ejecting from the chamber. I've already replace the extractor spring and insert to a BCM one, went out and shot about 40 rounds and I had one semi-stovepipe. Then I went and shot a practicial rifle match and had 1 on a stage and then it shot fine for another stage and then it started doing it almost every round to every other round. I replaced the bolt with a new one, a young manufactured bolt, and shot about 30-40 rounds out of it again and everything functioned perfectly. So any ideas to why this bolt is having ejecting problems? Could the extractor itself be bad possibly? |
|
Quoted:
Ok here's what I got. I have a 14.5 M4 uppper that has about 300-400 rounds through it, I believe, so it's still fairly new. Anyways I started this thread a month ago or so Old Thread The problem I am still having is that the bolt is picking up the fired case and pulling it back but it is not ejecting. The round is maybe a quater of the way out of the chamber, almost to the point of a stove pipe, but just short of it. The round is being picked up by the bolt but not ejecting from the chamber. I've already replace the extractor spring and insert to a BCM one, went and shot it about 40 round and I had one semi-stovepipe. Then I went and shot a practicial rifle match and had 1 on a stage and then it shot fine for another stage and then it started doing it almost every round to every other round. I replaced the bolt with a new one, a young manufactured bolt, and shot about 30-40 rounds out of it again and everything functioned perfectly. So any ideas to why this bolt is having ejecting problems? Could the extractor itself be bad possibly? sounds like the SPRING is to TIGHT / strong wich can and will cause problems stick with GI specs unless you see problems |
| Could be a gas-system issue too. I'd probably pull it apart and make sure there are no obstructions or other funkiness... After you make sure it's not the buffer spring. Could even be the gas-rings in the bolt. Something as simple as the break in the rings lining up and letting too much gas thru. Just my $0.02... FWIW |
|
Didn’t read your old thread, but have you checked the operation of the EJECTOR itself?
Brass shavings, especially the ones found on new weapons, can become lodged in the ejector passage of the bolt. This can hinder ejector operation or even stop it altogether. ETA: Read your old thread. Looks like I recommended checking EJECTOR operation and lubrication. Did you? ETA II: From your old thread.......... Quoted:
I took the ejector off and cleaned it and under it and reassembled everything. It appears you might have the EJECTOR and EXTRACTOR confused with one another. |
|
Quoted:
Didn’t read your old thread, but have you checked the operation of the EJECTOR itself? Brass shavings, especially the ones found on new weapons, can become lodged in the ejector passage of the bolt. This can hinder ejector operation or even stop it altogether. I checked the ejector and it moves up and down okay, it's pretty stiff and seems comparable to the new "young manufactured" bolt. I tried to compare the two last night and the only thing that looked different to me was that the extractor on the old bolt. It looked like it was possibly sitting too deep into the bolt face (if that makes sense) compared to the "young's" bolt extractor. That's where it seems to be getting hung up on the ejecting part because I can just barely swipe it with my finger and the spent round comes off the bolt very easily. ETA: I guess that was a typo on my part. I do know the difference between the two, sorry for the confusion. |
|
Quoted:
Didn’t read your old thread, but have you checked the operation of the EJECTOR itself? Brass shavings, especially the ones found on new weapons, can become lodged in the ejector passage of the bolt. This can hinder ejector operation or even stop it altogether. ETA: Read your old thread. Looks like I recommended checking EJECTOR operation and lubrication. Did you? ETA II: From your old thread.......... Quoted:
I took the ejector off and cleaned it and under it and reassembled everything. It appears you might have the EJECTOR and EXTRACTOR confused with one another. ETA: I guess that was a typo on my part because I know the difference between the two. Sorry for the confusion. |
|
Can you contact the source of the bolt, and exchange it for another?
If you visually inspected the bolt and weapon, and everything appears to be in serviceable condition, then swapped out the questionable bolt and the weapon functioned fine, I would try to exchange the bolt. |
|
Quoted:
Could the extractor itself be bad possibly? Could be. You’ve already invested in a BCM upgrade kit. This seemed to help somewhat, right? Before you go to the trouble of exchanging the bolt as I mentioned above, you might want to try replacing the extractor. With Mfgr’s pumping out parts and rifles to fulfill orders, I think QC has taken a backseat to sales. |
| Polish out the chamber with something like the REM bore cleaner that walmart sell in white plastic bottle or a metal paste cleaner. Clean all that with brake cleaner spray and while at it blow out the gas tube. Go to Fulton Armory and buy a new extractor and most important of all get the D-Fender ring to go around the extractor spring. Change ammo If it was mine I would replace the bolt and add a d-fender ring to the new bolt and extractor.––from Fulton. Keep in mind ammo can do this also if its not correct . Are you shooting the white box ammo by any chance. |
|
Quoted:
Quoted:
Could the extractor itself be bad possibly? Could be. You’ve already invested in a BCM upgrade kit. This seemed to help somewhat, right? Before you go to the trouble of exchanging the bolt as I mentioned above, you might want to try replacing the extractor. With Mfgr’s pumping out parts and rifles to fulfill orders, I think QC has taken a backseat to sales. +1 Back seat!! new extractor or buy another bolt /exchange QUIB So it aint cause the insert/ and spring is TOO STRONG adding the Oring and spring can be pretty strong I have a BCM Oring /Spring on my Back up Bolt Pain in the ass to get it in! I had to squeeze hard Bravocompany said has seen problems with TO Strong or to Weak |
|
I have never seen an extractor that was too strong.
I think the stronger the grab it has on the brass the better it can pull it out of a dirty chamber. If the ejector spring isn't weak or sluggish then you might want to look into replacing the gas rings. This may be a short stroke problem as well, is it a factory upper? |
| I agree on never too tight on the extractor spring in a 14.5 barrel. The bolts and extractors sometimes are not in correct tolerance to get a perfect angle on the extractor pull and the d-fender ring helps. Its a matter of just finding what is what by doing one thing at a time. I have seem ammo do these problems . Also a weak recoil spring causing excessive bolt carrier bounce. I would start with the bolt , extractor, d-fender ring change out . What is really hard to find is when you have a spring that only looses tension when hot. |
|
Quoted:
Sounds like you need a new ejection port cover, like this one: http://noveskerifleworks.com/imimg/portdoor_1a.jpg  This is the tech section, not GD. 
|
|
Factory complete upper with bolt and bolt carrier and I am using PPU M193 so I don't think the ammo is the problem. I don't think that short stroking is the problem either because the replacement bolt that I put in it works fine and I am using the same bolt carrier that came with the upper.
I am going to contact the company from where I bought the upper and see what they say. If I don't hear anything back from them in a few days I'll just order a new extractor and see if that fixes the bolt's problems. I guess if that doesn't fix it I could look at replacing the gas rings next, that would be my only other guess to why that particular bolt is not working. Would that be the other option? The gas rings seem fine to me though and I have them offsetting each other so they aren't aligned. |
|
Quoted:
Factory complete upper with bolt and bolt carrier and I am using PPU M193 so I don't think the ammo is the problem. I don't think that short stroking is the problem either because the replacement bolt that I put in it works fine and I am using the same bolt carrier that came with the upper. I am going to contact the company from where I bought the upper and see what they say. If I don't hear anything back from them in a few days I'll just order a new extractor and see if that fixes the bolt's problems. I guess if that doesn't fix it I could look at replacing the gas rings next, that would be my only other guess to why that particular bolt is not working. Would that be the other option? The gas rings seem fine to me though and I have them offsetting each other so they aren't aligned. It doesn't matter if they are aligned or not as they will move all over while you are shooting. Did you say the ejector of the non working bolt sits lower in the bolt face than the ejector of the bolt that worked? It looks like you were talking about the extractor. |
|
Quoted:
Quoted:
Quoted:
Could the extractor itself be bad possibly? Could be. You’ve already invested in a BCM upgrade kit. This seemed to help somewhat, right? Before you go to the trouble of exchanging the bolt as I mentioned above, you might want to try replacing the extractor. With Mfgr’s pumping out parts and rifles to fulfill orders, I think QC has taken a backseat to sales. +1 Back seat!! new extractor or buy another bolt /exchange QUIB So it aint cause the insert/ and spring is TOO STRONG adding the Oring and spring can be pretty strong I have a BCM Oring /Spring on my Back up Bolt Pain in the ass to get it in! I had to squeeze hard Bravocompany said has seen problems with TO Strong or to Weak I installed a Wolf extra power spring and an Oring in one of my bolts once and it was very hard to get the pin back in. After I finally did, I took a live round, slipped the rim under the extractor and then forced the case head down on the bolt face. When I let it go, it just sat there. The ejector couldn't push it off(usually they go flying). I figured that was too much. I just use an Oring in that bolt. |
|
Quoted:
Factory complete upper with bolt and bolt carrier and I am using PPU M193 so I don't think the ammo is the problem. I don't think that short stroking is the problem either because the replacement bolt that I put in it works fine and I am using the same bolt carrier that came with the upper. I am going to contact the company from where I bought the upper and see what they say. If I don't hear anything back from them in a few days I'll just order a new extractor and see if that fixes the bolt's problems. I guess if that doesn't fix it I could look at replacing the gas rings next, that would be my only other guess to why that particular bolt is not working. Would that be the other option? The gas rings seem fine to me though and I have them offsetting each other so they aren't aligned. Try swapping extractors from the working bolt to the problematic bolt and see if the problem continues. If the extractor from the working bolt doesn't work in the problem bolt, I'd change the gas rings. |
AR Sponsor