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Posted: 11/24/2015 10:43:38 PM EDT
It appears that the roll pin on the extractor has walked out.
I can't drive it back in since it was bent when the bolt attempted to go into battery. My issue is the bolt is caught partially in the buffer tube & I can't get the upper & lower separated. I'm thinking I need to remove the buffer tube to safely get the receivers apart? See thread title. 
You can see the pin, sort of, in the ejection port. 
A bit better image. The pin sticking out won't allow the bolt to rotate & retract. Thanks Update: I've been in contact with Kurt at KAK, He was quick to respond to my issue. Just to point out this BCG has worked flawlessly from day one. The whole rifle has as a matter of fact. Fit & finish on it is nice & what I would expect. Kurt wants to look at the BCG since he has not experienced this issue & has stepped up to the plate & will send a new BCG to me. Gotta love a US made manufacturer that stands behind his product. |
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Posted: 11/24/2015 11:24:50 PM EDT
[#1]
people smarter than me will chime in, but have you tried the forward assist?
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Posted: 11/24/2015 11:39:22 PM EDT
[#2]
FA won't do it, I just want to confirm removing the buffer tube to separate the receivers is the correct way to get them apart.
With the bolt partially stuck in the tube the receivers won't come apart. Edit: Spelling. |
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Posted: 11/24/2015 11:49:12 PM EDT
[#3]
Note to self: don't get a KAK BCG.
I've never heard of this before. I really don't know, and am curious. Any way you can snip or grind down the pin through the mag well? Maybe try to pull it the rest of the way out? |
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Posted: 11/24/2015 11:53:36 PM EDT
[#4]
I would very carefully try to grind that down with a small bit on the pencil Dremel extension and hope for the best. Take your time.
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Posted: 11/24/2015 11:57:23 PM EDT
[#5]
There really isn't a "correct" way to solve this.
If you remove the receiver extension, you can remove the spring and buffer, but the bolt carrier will still be locking the upper and lower together if it is seized in place (e.g. Cam pin is all jacked up). If the bolt carrier can move freely towards the rear, remove it and separate the upper and lower. |
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Posted: 11/24/2015 11:58:39 PM EDT
[#6]
Quote HistoryQuoted:
I would very carefully try to grind that down with a small bit on the pencil Dremel extension and hope for the best. Take your time. I have considered this approach, I'd have to use a thin metal shim to protect the receiver from getting scarred, at this point I don't care about the bolt. |
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Posted: 11/25/2015 12:00:10 AM EDT
[#7]
Quote HistoryQuoted:
There really isn't a "correct" way to solve this. If you remove the receiver extension, you can remove the spring and buffer, but the bolt carrier will still be locking the upper and lower together if it is seized in place (e.g. Cam pin is all jacked up). If the bolt carrier can move freely towards the rear, remove it and separate the upper and lower. Ok that's what I thought, yes the bolt moves freely in the upper. Thanks for the confirmation. |
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Posted: 11/25/2015 12:09:41 AM EDT
[#8]
Removing both takedown pins wont let you separate receivers?
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Posted: 11/25/2015 12:14:23 AM EDT
[#9]
If needed couldnt you drive pin back into bolt even if bent and allow cam to move and get BCG out?
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Posted: 11/25/2015 12:15:02 AM EDT
[#10]
Quote HistoryQuoted:
Removing both takedown pins wont let you separate receivers? No the bolt won't rotate back into the carrier, the back end of the carrier is still in the tube. |
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Posted: 11/25/2015 12:15:43 AM EDT
[#11]
Quote HistoryQuoted:
If needed couldnt you drive pin back into bolt even if bent and allow cam to move and get BCG out? I can't get on the pin at the right angle. |
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Posted: 11/25/2015 12:26:44 AM EDT
[#12]
Did you not get the retaining pin on the firing pin correctly letting the firing pin slide out the back and letting the cam pin rotate?
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Posted: 11/25/2015 12:49:09 AM EDT
[#13]
Quote HistoryQuoted:
No the bolt won't rotate back into the carrier, the back end of the carrier is still in the tube. Quote HistoryQuoted:
Quoted:
Removing both takedown pins wont let you separate receivers? No the bolt won't rotate back into the carrier, the back end of the carrier is still in the tube. You don't need it to rotate back in. Punch out the front and rear take down pins. Then slide the entire upper forward. |
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Posted: 11/25/2015 2:06:24 AM EDT
[#14]
As already mentioned, try pushing out the front pivot pin & rear take down, then sliding the upper and lower receiver assemblies apart by pushing up and forward. If that doesn't work, then maybe try attacking the offending pin by using a long shaft drive pin punch, going up through the magazine well, and tap on the pin to knock it loose. Another option would be a very long dremel type shaft/bit combo with stone to maybe grind the pin down.
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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Posted: 11/25/2015 2:10:38 AM EDT
[#15]
Pull the pin out.
And or a dental pick to punch down |
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Posted: 11/25/2015 5:54:16 AM EDT
[#16]
Slam the end of the barrel on a block of wood on a cement floor . with the weapon at a 90 degrees from the floor
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Posted: 11/25/2015 7:32:47 AM EDT
[#17]
Quote HistoryQuoted:
As already mentioned, try pushing out the front pivot pin & rear take down, then sliding the upper and lower receiver assemblies apart by pushing up and forward. If that doesn't work, then maybe try attacking the offending pin by using a long shaft drive pin punch, going up through the magazine well, and tap on the pin to knock it loose. Another option would be a very long dremel type shaft/bit combo with stone to maybe grind the pin down. CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 I'm going to agree with this. I ASSumed you already tried removing the takedown and pivot pins first. 
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Posted: 11/25/2015 8:31:32 AM EDT
[#18]
Quote HistoryQuoted:
I'm going to agree with this. I ASSumed you already tried removing the takedown and pivot pins first. Quote HistoryQuoted:
Quoted:
As already mentioned, try pushing out the front pivot pin & rear take down, then sliding the upper and lower receiver assemblies apart by pushing up and forward. If that doesn't work, then maybe try attacking the offending pin by using a long shaft drive pin punch, going up through the magazine well, and tap on the pin to knock it loose. Another option would be a very long dremel type shaft/bit combo with stone to maybe grind the pin down. CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 I'm going to agree with this. I ASSumed you already tried removing the takedown and pivot pins first. Yes, both TD pins come free & the receivers are loose, the carriers is partially in the buffer tube. The rear TD pin hole in the upper will not allow the upper to slide forward enough to get carrier out of the tube. I'll try to pull the pin out with needle nose pliers as suggested or I have a beater chisel I can sharpen & maybe cut the pin off flush. I'll report back. |
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Posted: 11/25/2015 8:48:12 AM EDT
[#19]
Is the cam pin installed? I did not think the extractor pin was exposed so it could walk out?
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Posted: 11/25/2015 9:08:47 AM EDT
[#20]
Quote HistoryQuoted:
Pull the pin out. http://shop.wirecutterstore.com/assets/images/26-11-200-knipex-needle-nose-pliers-cutter.jpg And or a dental pick to punch down Ok, I got the pin out. 
While shooting the rifle the extractor pin walked out of the bolt not letting the BCG into battery. I wasn't able to grab the pin at first with the pliers but did push it up & out enough with an ice pick. At that point I could grab the pin with pliers & remove it. The bolt then slide back into the carrier & I could open the receivers. 
Other than the pin, the other parts of the BCG are not damaged. |
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Posted: 11/25/2015 9:11:24 AM EDT
[#21]
Quote HistoryQuoted:
Is the cam pin installed? I did not think the extractor pin was exposed so it could walk out? That is a good point, This is a .308 caliber rifle. I'll look at my other BCG in my AR15 & see. If the extractor pin is buried in the carrier, what would cause the bolt to move forward that much & let the pin walk? |
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Posted: 11/25/2015 9:39:42 AM EDT
[#22]
Quote HistoryQuoted:
Did you not get the retaining pin on the firing pin correctly letting the firing pin slide out the back and letting the cam pin rotate? The last time I disassembled & cleaned the BCG I'm pretty sure I got it right. I have been shooting the rifle up until this issue happened. I'm pretty sure the firing pin would not hit the primer if the retaining pin was not in the correct location on the FP. Anything is possible, that's why I'm here. |
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Posted: 11/25/2015 11:22:25 AM EDT
[#23]
Just curious, is that one of their new double ejector BCG's?
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Posted: 11/25/2015 11:23:16 AM EDT
[#24]
Quote HistoryQuoted:
Just curious, is that one of their new double ejector BCG's? It is not. |
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Posted: 11/25/2015 11:26:30 AM EDT
[#25]
Just to add, when I got the BCG out, both retaining pin & bolt cam were in the proper orientation.
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Posted: 11/25/2015 11:38:00 AM EDT
[#26]
Weak extractor spring? One of the first rifles I bought had what I thought was a weak extractor spring. Extraction wasn't a problem, but when cleaning it took just a tiny bit of pressure on the extractor and a gentle tap of the bolt on the bench and the pin would fall out. That worried me. I thought something exactly like this might happen. I ordered new springs and I felt a tremendous difference in spring tension. It seems spring tension is what keeps the pin from walking. Just a thought |
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Posted: 11/25/2015 3:53:28 PM EDT
[#27]
Quote HistoryQuoted:
Weak extractor spring? One of the first rifles I bought had what I thought was a weak extractor spring. Extraction wasn't a problem, but when cleaning it took just a tiny bit of pressure on the extractor and a gentle tap of the bolt on the bench and the pin would fall out. That worried me. I thought something exactly like this might happen. I ordered new springs and I felt a tremendous difference in spring tension. It seems spring tension is what keeps the pin from walking. Just a thought I never had an ejection or extraction issue with this BCG. |
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Posted: 11/25/2015 4:06:16 PM EDT
[#28]
Quoted:
Just to point out this BCG has worked flawlessly from day one. The whole rifle has as a matter of fact. This does not compute. I don't understand why people say this kind of stuff. I would call this a catastrophic failure. |
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Posted: 11/25/2015 4:26:50 PM EDT
[#29]
Quote HistoryQuoted:
This does not compute. I don't understand why people say this kind of stuff. I would call this a catastrophic failure. Quote HistoryQuoted:
Quoted:
Just to point out this BCG has worked flawlessly from day one. The whole rifle has as a matter of fact. This does not compute. I don't understand why people say this kind of stuff. I would call this a catastrophic failure. Because up until last night it did. Not a catastrophe as you put it. No one was hurt, gun did not blow up. I have no idea why it happened but the manufacturer has stepped up to figure it out & make it right. Can you say that about every firearm component manufacturer? I bet ammunition causes more problems than anything else. |
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Posted: 11/25/2015 4:31:58 PM EDT
[#30]
If the gun stops running and can't be fixed in the field, I'd call that catastrophic. That's just my opinion.
I just don't get the appraisal of the gun based on everything that happened right up until it failed. It's like when I hear people say they are happy with their new carry gun, they ran 100 rounds through it and it's "flawless". I don't know, it's just a pet peeve of mine. Disregard it. It's not that important in the long run. |
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Posted: 11/25/2015 4:33:53 PM EDT
[#31]
Quote HistoryQuoted:
Because up until last night it did. Not a catastrophe as you put it. No one was hurt, gun did not blow up. I have no idea why it happened but the manufacturer has stepped up to figure it out & make it right. Can you say that about every firearm component manufacturer? I bet ammunition causes more problems than anything else. Quote HistoryQuoted:
Quoted:
Quoted:
Just to point out this BCG has worked flawlessly from day one. The whole rifle has as a matter of fact. This does not compute. I don't understand why people say this kind of stuff. I would call this a catastrophic failure. Because up until last night it did. Not a catastrophe as you put it. No one was hurt, gun did not blow up. I have no idea why it happened but the manufacturer has stepped up to figure it out & make it right. Can you say that about every firearm component manufacturer? I bet ammunition causes more problems than anything else. I think catastrophic failure would be a failure that prevent the weapon from functioning and can't readily be remedied in the field But I have been around before |
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Posted: 11/25/2015 4:47:36 PM EDT
[#32]
On a two way range I can certainly agree.
The positive thing I can take away from this is that I have better experience to diagnose this problem. I have no problem admitting I new to this platform & I'm here to learn. I've seen plenty of other issues posted in this forum that get plenty of help to resolve. Others ask for more information & I am just trying to provide the best picture I can so folks can make intelligent responses. |
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Posted: 11/25/2015 5:33:59 PM EDT
[#33]
Quote HistoryQuoted:
On a two way range I can certainly agree. The positive thing I can take away from this is that I have better experience to diagnose this problem. I have no problem admitting I new to this platform & I'm here to learn. I've seen plenty of other issues posted in this forum that get plenty of help to resolve. Others ask for more information & I am just trying to provide the best picture I can so folks can make intelligent responses. Indeed. I try to keep that attitude myself when something expensive breaks. Is hard though. Fortunately in your case you didn't have to come out of pocket to fix it. |
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Posted: 11/25/2015 7:19:02 PM EDT
[#34]
Quote HistoryQuoted:
Indeed. I try to keep that attitude myself when something expensive breaks. Is hard though. Fortunately in your case you didn't have to come out of pocket to fix it. Quote HistoryQuoted:
Quoted:
On a two way range I can certainly agree. The positive thing I can take away from this is that I have better experience to diagnose this problem. I have no problem admitting I new to this platform & I'm here to learn. I've seen plenty of other issues posted in this forum that get plenty of help to resolve. Others ask for more information & I am just trying to provide the best picture I can so folks can make intelligent responses. Indeed. I try to keep that attitude myself when something expensive breaks. Is hard though. Fortunately in your case you didn't have to come out of pocket to fix it. We also have a US made manufacturer that stands behind his product. I chose to use several parts suppliers that had no reviews on their product for 2 reasons. They were made in the US & of course in my price point. I can't afford tier 1 shit & I'm not shooting this rifle to defend my life. If KAK backs up the part & is able to make a better component because of it, I'm on board. How else are we going to find new sources unless you give it a shot. It impressed me that KAK didn't hesitate to resolve the issue. ETA: This was my 1st build ala cart. Took almost a year to choose everything needed to assemble & get it to the range. I had a gunsmith help me with the barrel install on the upper but I sat at my kitchen table & put everything else together in about an hour. Took it down stairs & shot it. I did replace the GI type trigger with a 2 stage Geissele. I've been testing commercial ammo for accuracy and will create a thread when I'm done. Reloading for this rifle is my next adventure. This whle process costs me a buttload of money lol |
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