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Posted: 5/4/2011 11:29:04 AM EDT
| Rifle with RDIAS functions on f/a but malfunctions on s/a. Fires one shot on s/a, ejects empty, chambers new round and then it's like the hammer does not cock. Help please. |
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Disconnector is not catching the hammer, so the hammer follows the bolt carrier home.
Function test: with rifle cleared and pointed in a safe direction, selector set to semi, press and hold the trigger and charge the rifle. VERY SLOWLY let off the trigger. If the hammer falls, the disconnector needs to be replaced or filed to adjust its overlap. |
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Quoted: Disconnector is not catching the hammer, so the hammer follows the bolt carrier home. But since it is an RDIAS, the RDIAS catches the hammer on every shot and does not release it until the carrier trips it. So he should be getting F/A fire in S/A if the disconnector does not work. I agree though, if hammer is forward after a S/A round is fired, the trigger/disconnector is not working, just I would expect a different symptom. |
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Quoted:
But since it is an RDIAS, the RDIAS catches the hammer on every shot and does not release it until the carrier trips it. So he should be getting F/A fire in S/A if the disconnector does not work. I agree though, if hammer is forward after a S/A round is fired, the trigger/disconnector is not working, just I would expect a different symptom. Since the disconnector is held back in auto, it doesn't matter that the sear catches in both semi and auto with an RDIAS. The disconnector has to function properly in semi whether there's an RDIAS installed or not, and it sounds like it's got insufficient overlap. Lack of FA with malfunctioning disconnector, though, poses an intriguing additional factor. |
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Quoted: Quoted: But since it is an RDIAS, the RDIAS catches the hammer on every shot and does not release it until the carrier trips it. So he should be getting F/A fire in S/A if the disconnector does not work. I agree though, if hammer is forward after a S/A round is fired, the trigger/disconnector is not working, just I would expect a different symptom. Since the disconnector is held back in auto, it doesn't matter that the sear catches in both semi and auto with an RDIAS. The disconnector has to function properly in semi whether there's an RDIAS installed or not, and it sounds like it's got insufficient overlap. Lack of FA with malfunctioning disconnector, though, poses an intriguing additional factor. In a functioning gun no, but we are talking a non-function gun. My point. |
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This problem boggles my mind. The only possible explanation I can think of is if the bottom of the trip is a little too low (or hammer hook too high), the tail of the hammer hits the tail of the disconnector, which both disengages the disconnector and stops the hammer from traveling far enough back to be caught by the trip/sear, and the hammer follows the bolt carrier. On full auto, the disconnector is cammed out of the way of contact with the hammer and the hammer travels far enough back to be caught by the trip/sear.
Is this upper/lower combination well sorted out in semi without the RDIAS installed? (Assuming you install a semiautomatic selector, and can assemble it in a manner that does not create an unregistered SBR.) What is your cyclic rate on FA? Please provide details on your weapon configuration. Karl |
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