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Posted: 11/7/2005 9:35:27 AM EDT
[#1]
does it happen with the mag out or mag in??
remove bolt from bolt carrier and slide the bolt carrier in to the upper receiver (when it's shotgunned open). does the bolt carrier go all the way down? more specifically, do the gas key and gas tube align properly?? with the upper held at a 45 degree angle slide the bolt carrier into the upper receiver. Hold the bolt carrier about 2 to 3 inches out of the receiver and release it, it should slide down and the gas key slide over the gas tube with little or no interference. The bolt carrier should slide home. report back with results. |
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Posted: 11/7/2005 9:45:57 AM EDT
[#2]
The bolt slides home when it's shotgunned open and no there isn't a mag in at all. I'm assuming that the key is properly alligned since it slides in without any restriction when it's the upper and lower is cracked open. The only other thing I can think of is that I replaced the buffer spring detent and detent spring too. Could it be hanging up there and if so is there a certain detent used for Cav lowers?
Thanks for you help man. cp
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Posted: 11/7/2005 10:17:09 AM EDT
[#3]
do you mean the buffer retaining pin and spring??
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Posted: 11/7/2005 11:13:02 AM EDT
[#4]
Yes, sorry. I called Cavarms and they suggested not using the retaining pin and spring. I'll give that a try. What do you think?
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Posted: 11/7/2005 11:27:46 AM EDT
[#5]
Also make certain that the bolt carrier isn't hanging up on the hammer (or bolt catch). You've thouroughly function checked the lower I hope. What configuration is your BC?
If you have a full circle BC it's possible that it might be snagging the back of the bolt carrier. |
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Posted: 11/7/2005 11:44:48 AM EDT
[#6]
I'm still somewhat of a newbie with ARs and I've never heard of "full circle BC". I'll post a pic when I get home of my BC. The BC is made by Smith Enterprises and last Friday I took it down there. They replaced some springs and cleaned it up a little bit. When I was orginally having extrator issues a couple of months ago I swaped out the bolt from another AR and it worked fine, that's why I fugured that my extractor spring was worn out since it was a used BC. When I pulled the ext. spring it was pretty weak with an O ring in there too.
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Posted: 11/7/2005 3:54:08 PM EDT
[#7]
Here's pics of my bolt. I also removed the buffer retaining pin and spring and it still won't go into battery. I removed my bolt catch to see if it was hanging up there and it still doesn't work.
Let me know what you think. cp    
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Posted: 11/7/2005 4:05:37 PM EDT
[#8]
Post a pic of your hammer face cocked back
Looks like your hammer may be catchin your bolt. |
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Posted: 11/7/2005 4:32:21 PM EDT
[#9]
Are these the pics you wanted? If my hammer face is catching the bolt what do I need to do?
 
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Posted: 11/7/2005 4:50:01 PM EDT
[#10]
The top of the hammer is it worn more than the rest the pic is fuzzy but it looks that way.
If so do a test run without the hammer installed and see if it still hangs. |
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Posted: 11/7/2005 4:51:35 PM EDT
[#11]
more specifically, your hammer may be catching/dragging on your firing pin.
try this just for fun. remove the firing pin from the bolt and run the bolt carrier through the upper to see if it still catches. |
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Posted: 11/7/2005 4:56:25 PM EDT
[#12]
The hampper does look a little worn there. What do I need to do if it's hanging there?
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Posted: 11/7/2005 5:11:28 PM EDT
[#13]
I took the hammer out and guess what??? It didn't hang. Do I need a different hammer or can I just modifiy this one?
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Posted: 11/7/2005 5:19:34 PM EDT
[#14]
Tagged out of curiosity for the final diagnosis.
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Posted: 11/7/2005 5:32:50 PM EDT
[#15]
tweak has a pic of a hammer and the area that should be relieved.
lemme see if I can find it. from the FAQ's: "When used with slotted bolt carriers, hooked hammers can catch the underside of the firing pin, especially if the firing pin has a larger spool on it like those intended for the M16. The hammer will force the pin rearward against the firing pin retaining pin during the battery stroke. With repetition, this will bend the firing pin retaining pin. Sometimes the firing pin retaining pin is a simple, non-hardened, cotter pin. Some of these bend rather quickly. If you hold the trigger to the rear while working the bolt back and forth with the charging handle and the catch disappears you probably have an issue between the hammer and the firing pin. The best fix is to use a shrouded bolt carrier. You can also round the hook on the hammer to prevent it from snagging on the firing pin spool. A short trigger can also cause this by allowing the hammer to sit up too high when cocked." your best bet is to get a shrouded bolt carrier. still looking for the pic. |
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Posted: 11/7/2005 7:05:24 PM EDT
[#16]
Just get a new hammer. This has happened to me once as well. Your best bet is to get a new hammer from someone. Ill see if I can stir you up one tomorrow.
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Posted: 11/7/2005 7:08:48 PM EDT
[#17]
Thank you everyone!!!
cp
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Posted: 11/7/2005 9:02:13 PM EDT
[#18]
best bet is a fully shrouded bolt carrier.
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Posted: 11/7/2005 9:06:35 PM EDT
[#19]
+1 |
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Posted: 11/8/2005 1:24:22 AM EDT
[#20]
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Posted: 11/8/2005 6:19:04 AM EDT
[#21]
Thanks Tweak!
(my search-Fu is very weak...........) |
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Posted: 11/8/2005 6:32:11 AM EDT
[#22]
Shrouded bolt carrier or new hammer??? Where do I begin???
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Posted: 11/8/2005 7:36:03 AM EDT
[#23]
shrouded bolt carrier.
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Posted: 11/8/2005 12:28:34 PM EDT
[#24]
Shrouded carrier but in the mean time you could just run your hammer along a grinder for a sec and that would be a quick fix. Just shave it back to the white line in the pic. Hammers are alot cheaper than a new carrier
 I dont have a spare ( I was thinking I did) but Im sure someone here does just post in the WTB Forum and someone will help. |
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Posted: 11/8/2005 12:32:48 PM EDT
[#25]
What is the worst that can happen by me shaving the hammer down?
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Posted: 11/8/2005 12:41:42 PM EDT
[#26]
you can cut off so much that the hammer will no longer cock
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Posted: 11/8/2005 3:12:27 PM EDT
[#27]
Yes, you can shave too much off of the step and it won't be pushed down far enough to reset the hammer, but, you may as well try at this point. You would be surprised how much you can take off before it will not reset. Just grind a 1/16" off at a time and try to smooth out the sharp surface and you should be O.K.
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Posted: 11/8/2005 4:00:33 PM EDT
[#28]
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Posted: 11/8/2005 5:29:19 PM EDT
[#29]
Hello
I had the same problem with a eagle lower i had that was slightly out of spec holes drilled just a c hair to high turns out there are differant hammer hights and if you have a lower that is slightly out of spec (Yes it happens) then the taller one will not work it just scraps the 2 guides on the carrier i managed to get it to work better using a shilded carrier but it would still have feed and ejection problems i had several hammers on hand so i was able to compare them and sure as shit they were differant heights and i replaced it with a shorter one and whola it was solved not saying that for sure that is your problem but it sure sounds like it |
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Posted: 11/8/2005 8:01:02 PM EDT
[#30]
tweeter:
Whiskey Tango Foxtrot??? |
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Posted: 11/8/2005 8:05:48 PM EDT
[#31]
tag. i wanna see what's causing the problem and how it's gonna get fixed. |
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Posted: 11/9/2005 6:43:13 AM EDT
[#32]
My .02 |
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Posted: 11/9/2005 7:24:29 AM EDT
[#33]
i like using "My Active Topics"
mostly because i'm lazy and a post whore. |
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Posted: 11/9/2005 4:17:50 PM EDT
[#34]
After some grinding via the dremmel it now works perfectly. I haven't taken it to the range yet but it seems to being going into battery just fine. I attached some pics of the grinded hammer. Thanks for everyone's help.
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Posted: 11/10/2005 8:53:14 AM EDT
[#35]
I like happy endings!
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Posted: 11/10/2005 8:57:53 AM EDT
[#36]
Me too, I just hope that it works at the range too.
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Posted: 1/15/2006 7:34:34 PM EDT
[#37]
It didn't work out at the range. First round fed and fired but then the next round got caught up and didn't feed properly. Tried it 3 or 4 times and same problem...
UGH!!! What's next fully shrouded bolt carrier???
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Posted: 1/16/2006 9:26:04 AM EDT
[#38]
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Posted: 1/16/2006 5:21:55 PM EDT
[#39]
Don't know, I'll have to post a pic in order for you to tell me or not.
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Posted: 1/16/2006 9:46:27 PM EDT
[#40]
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Posted: 1/17/2006 11:34:09 PM EDT
[#41]
I found a couple of my pictures that relate to this thread...
Here is the view showing the hammer modification:  Here is the measurement you should stay BELOW to eliminate problems: 
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Posted: 1/18/2006 9:28:03 AM EDT
[#42]
How's the mag you are using? any unusual signs of getting hit in the rear on the lips or metal missing? The B/BC works fine with no mag. Replace empty, clean, well used mag. check. Is the carrier hitting the mag on the lips? If that is OK try 1 round in mag . Could the round be hanging on the front of the mag? If that is OK try 20/30? to see if pressure is expanding lips and causing carrier to hit?
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Posted: 1/18/2006 10:34:18 AM EDT
[#43]
The bolt is sometimes hanging without a mag even in there.
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Posted: 1/18/2006 11:12:18 AM EDT
[#44]
Well, that narrows it down. The carrier, hammer, gas tube, gas key, buffer and buffer retainer are always in there. Gotte be one of those. |
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Posted: 1/18/2006 11:14:59 AM EDT
[#45]
Sorry to be so vague. Thanks for your help. Tonight I will start the troubleshooting again. I'm going to remove the hammer to see if it's still hanging up without it installed.
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Posted: 1/28/2006 6:47:03 PM EDT
[#46]
Just tossed in my buddies oly arms bolt and carrier and my AR hang up halfway to battery. So would you say now that it's my carrier?
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Posted: 1/28/2006 9:07:37 PM EDT
[#47]
Does the carrier/bolt still hang up when you hold the trigger back and charge the rifle?
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Posted: 1/29/2006 3:49:31 PM EDT
[#48]
Good idea, this way the disconnector is holding the hammer still and it will be resting lower down. I think the way to check this is the empty the rifle, pull the trigger so the the hammer falls, continue to hold the trigger and then hand cycle the charging handle. The hammer will be down a little bit more then if the bolt still hangs up, you should be looking more into gas tube alignment or something other than hammer hitting the carrier. |
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Posted: 1/29/2006 3:52:53 PM EDT
[#49]
If you swapped carriers and the problem is the same, then I can safely say that your carrier and gas key is probably fine, or your buddy's is equally fubar. I'll assume your buddy's rifle runs fine and that your carrier is probably OK too. Look at hammer heights and gas tube alignment. |
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Posted: 1/29/2006 5:08:51 PM EDT
[#50]
Is there any chance you could swap the other (Oly) lower onto your upper? |
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