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Posted: 2/4/2021 12:31:13 PM EDT
[#1]
Is it missing a firing pin? Did the unfired rounds have a dimple?
 How to Assemble an AR-15 Bolt Carrier Group Presented by Larry Potterfield of MidwayUSA |
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Posted: 2/4/2021 2:11:13 PM EDT
[#2]
^ ^ ^ What he said. Inspect the primer and confirm you have a firing pin.
Not 100% sure, but is it possible that the hammer spring is not installed quite right causing light primer strikes? |
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Posted: 2/4/2021 2:14:09 PM EDT
[#3]
Step 1 - disassemble BCG, inspect it all, fix as needed, assemble with oil.
Is the bolt actually locking into the extension? |
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Posted: 2/6/2021 1:00:16 AM EDT
[#4]
Quote HistoryQuoted: Is it missing a firing pin? Did the unfired rounds have a dimple?  https://www.youtube.com/watch?v=ZBd8o3JBpVo |
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Posted: 2/8/2021 7:10:08 AM EDT
[#5]
Sounds like firing pin protrusion issue, either a short pin, out of spec hole, or the protruding portion of the pin is too fat. The pin is the easiest part to measure with a caliper. The protrusion itself a little bit tougher to measure accurately without the right gauge. That's where I would start looking though.
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Posted: 2/8/2021 7:39:32 AM EDT
[#6]
There is a firing pin in it or OP would be asking why his BCG was stuck. The cam pin can turn wrong without it and jam things up.
Odds are the bolt isn't going into battery. |
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Posted: 2/8/2021 7:54:34 AM EDT
[#7]
Quote HistoryQuoted: There is a firing pin in it or OP would be asking why his BCG was stuck. The cam pin can turn wrong without it and jam things up. Odds are the bolt isn't going into battery. Easy enough to check. Pull the bolt from the carrier and see if it rotates in the barrel extension. Certainly could be headspace, though, one would think the OP would have noticed. I suppose the bolt could also have a bur. |
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Posted: 2/8/2021 7:56:36 AM EDT
[#8]
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Posted: 2/8/2021 8:17:35 AM EDT
[#9]
Cotter pin in wrong position related to firing pin?
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Posted: 2/8/2021 8:24:43 AM EDT
[#10]
Quote HistoryQuoted: Easy enough to check. Pull the bolt from the carrier and see if it rotates in the barrel extension. Certainly could be headspace, though, one would think the OP would have noticed. I suppose the bolt could also have a bur. OP has to one post. Don’t assume he would catch a bolt not in battery. |
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