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Old 01-08-2018, 01:05 PM   #1 (permalink)
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Troubleshooting my mag

I am pretty new to the mag scene and troubleshooting them. I am having some issues with my sear assembly I think. I just put the gun together and took it tot the field. Went to chrono it, and upon pulling the trigger say every 2-3 shots it would get stuck in a ďautoĒ trigger type of firing. It would rattle off 2 or 3 shots in a row, the pin would come back and hit the trigger and trip again without pulling off another shot. Seemed almost like a full auto. I do not have a rt, itís a standard mag with the stock parts. I did rebuild the valve, have no leaks.

I adjusted the pin back off a touch from the trigger but it got worse. Almost like the trigger isnít resetting. Any help would be great.

It is a benchmark frame I might add.


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Old 01-08-2018, 03:18 PM   #2 (permalink)
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first pull your sear out and check that the edge that catches the bolt is sharp, not rounded. next make sure that your trigger rod is hitting the top of the benchmark trigger if it is not, you are likely missing the pin in the frame to keep the rod up.

post some pics with it aired up and we can try and help.
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Old 01-08-2018, 03:55 PM   #3 (permalink)
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I will get the pictures of everything tonight.

But I do know that the pin in the frame is there, and the sear is sharp. Everything looks good from all the research and pictures and videos I have watched. I have another mag that had the old trigger frame on it and that worked fine. But the benchmark is acting up.


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Old 01-08-2018, 05:29 PM   #4 (permalink)
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rule of thumb is a credit card thickness gap between the end of the rod and the back of the trigger with the trigger held against the safety. now with benchmarks being slightly different geometry you may have to adjust for this a little.
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Old 01-08-2018, 06:18 PM   #5 (permalink)
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Old 01-08-2018, 06:19 PM   #6 (permalink)
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The pin was closer.... but it was shooting like I stated before when it was closer...

So when you say adjust for the different geo. In what way do I adjust?


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Old 01-08-2018, 06:32 PM   #7 (permalink)
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This was my culprit everyone. Bolt was badly worn. Rounded lip and wasnít allowing my sear to catch. Swapped bolts and itís totally fine! Lesson learned


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Old 01-08-2018, 06:35 PM   #8 (permalink)
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Bad picture of the bolt but whatev yíall can get the idea


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Old 01-08-2018, 06:39 PM   #9 (permalink)
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Weird thing is my other mag functions fine with that worn bolt. Meh oh well problem solved


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Old 01-08-2018, 09:20 PM   #10 (permalink)
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I want to say the bolt edge looks rounded. also if that mag is aired up the sear rod is not properly adjusted.
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