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Posted: 5/29/2013 2:44:58 PM EDT
[#1]
Check to see the carrier key is not loose on the bolt carrier.
If it is tighten and Use a punch to stake it. |
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Posted: 5/29/2013 3:03:26 PM EDT
[#2]
Sounds to me like it's short stroking.What kind of gas block you running?
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Posted: 5/29/2013 3:31:52 PM EDT
[#3]
Load a single round in the mag, chamber it, and fire it.
Does the bolt lock open on the empty mag? If not, you probably have an under gassing problem. Low gas pressure to the gas key.... is the gas key tight? Are the gas rings on the bolt? Someone just mount or remount the gas block/sight base? Using light reloads? Buffer too heavy? buffer spring too stiff? If the bolt locks open on an empty mag, try a different mag. |
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Posted: 5/29/2013 4:43:02 PM EDT
[#4]
thanks for the advice!!!
It did it with 2 different bolts one was a BCM bcg so I know its not a bcg /gas key issue.It does a a spikes buffer, not sure which one.Could this casue it to not pick up the next round.It goes into battery after the first shoot just no ammo gets loaded. |
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Posted: 5/29/2013 5:01:06 PM EDT
[#5]
Quoted: Check to see the carrier key is not loose on the bolt carrier. If it is tighten and Use a punch to stake it. My apologies if I come across one upping, but finding a staking tool is a better route. Punches can be very hard them with the shock. |
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Posted: 5/30/2013 1:47:02 AM EDT
[#6]
Quoted:
Gun details:sa&a lower Daniel defense 16 in barrel Yhm free float rail BCG is dpms I've tried swapping this upper on a functioning lower, with a different BCG and still the same problem.Load a round, fire, ejects shell, then click, fail to freed.I have also upgraded the extractor with bcm parts and still same problem.Any help? Thanks Use the function B/C from the function lower as well in the new upper for a single loaded round in a mag to see if the bolt will lock back on the mag catch after a single fired round. If you have problems still, the go back and clean the upper again, including the chamber with a chamber brush by hand with CLP, and with the bolt pulled off the old carrier, use the carrier alone in the upper to double check the alignment of the key to gas tube and to confirm that the carrier is not binding in the upper. This will at least narrow the problems down to either a bad head space, or leaking/blockage somewhere from the gas tube to the barrel port. |
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Posted: 5/30/2013 6:33:58 AM EDT
[#7]
Quoted: Usually, the next round fails to chamber because the bolt did not travel far enough rearward to get behind the next round in the mag and push it into battery. Usually, if the bolt doesn't travel rearward enough, there isn't enough gas pressure to push it back. This is the purpose of test firing the gun with only one round in the mag. If the bolt travels back far enough to lock it open on an empty mag, that should also be far enough to grab the next round. This is just a test to tell if you have enough gas pressure to force the bolt fully rearward.thanks for the advice!!! It did it with 2 different bolts one was a BCM bcg so I know its not a bcg /gas key issue.It does a a spikes buffer, not sure which one.Could this casue it to not pick up the next round.It goes into battery after the first shoot just no ammo gets loaded. This is not the only possibility but it is a very good first check. |
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