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Posted: 9/28/2008 6:01:19 PM EDT
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I put in a new trigger a week ago and I didn't have a problem with it. My dad took the AR out and said it was doubling. It is a 3 pound trigger, so I'm thinking he's bump firing it. Another thing, if it is doubling, why does it double, why doesn't it dump the rest of the mag? What should I do to diagnose the problem? Any suggestions? Thanks Steve |
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For starters......... The firing of two rounds on a single trigger pull. Causes: This is often due to the trigger pin backing out from engagement from one side or the other of the receiver. Loosening of the trigger pin in turn is due usually to a broken or to an incorrectly assembled hammer spring. The sear surfaces of the trigger or hammer may be worn and prevent full sear action. The disconnector hook and/or the disconnector surfaces on the hammer may be worn, allowing doubling. The disconnector spring may be weak. Corrective action: The hammer spring should be inspected for damage or incorrect assembly. Replace the hammer and trigger if their engagement doesn't provide positive hammer retention. The disconnector and/or hammer should be inspected for wear that would interfere with safety, and replaced if needed. The disconnector spring should be replaced. |
| Since you have made a change to the system by adding a new trigger... Perhaps the disconnctor isn't perfectly adjusted. The second possibility is that your dad is at least partially at fault. If the new trigger has an overtravel adjustment, it may need a slight bit more overtravel. |
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With 2-stage and light triggers you can accidentally bumpfire from a rest, from a table or from the shoulder. He is probably not fully pulling the trigger backwards, or not shouldering it tightly or something like that. I can bumpfire my 2-stange RRA trigger between 3-5 shots from my shoulder with ease. Of course the mechanical issues should be looked at first. |
The firing of two rounds on a single trigger pull. Causes: This is often due to the trigger pin backing out from engagement from one side or the other of the receiver. Loosening of the trigger pin in turn is due usually to a broken or to an incorrectly assembled hammer spring. The sear surfaces of the trigger or hammer may be worn and prevent full sear action. The disconnector hook and/or the disconnector surfaces on the hammer may be worn, allowing doubling. The disconnector spring may be weak. Corrective action: The hammer spring should be inspected for damage or incorrect assembly. Replace the hammer and trigger if their engagement doesn't provide positive hammer retention. The disconnector and/or hammer should be inspected for wear that would interfere with safety, and replaced if needed. The disconnector spring should be replaced. |
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