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Owner/Instructor at Semper Paratus Arms
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
I've had bad disconnector springs from Stag kits that would do this.
- Separate the upper and lower.
- Cock the hammer by pressing it down.
- Pull the trigger and ride the hammer forward so it doesn't slam against the lower.
-Keep holding the trigger to the rear and push down on the hammer. The hammer should stay down.
-Let the trigger forward. The hammer still should not release.
Do this a bunch of times.
If the gun fails this test and the LPK is verified to be installed correctly, there is something faulty with either the LPK (probably the disconnector) or with the lower...more likely the problem is with the LPK.
Start by replacing the LPK (really just the fire control group, or FCG).
I'm honestly not sure how it's possible to not know if the gun doubled or tripled. Seems like something you would be sure of if it happened.
If it fails the above test you'll know for sure. But it could pass 99 times and fail once. So for your own peace of mind you should replace the FCG anyway. That's what I would do at least.
I experienced a couple double-fires at the range recently, and when I was cleaning the AR afterwards, there was a drag on the firing pin when disassembling and re-assembling it. I pushed a pipecleaner thru the firing pin hole in the bolt carrier and out popped a piece of cleaning cloth.....No more double-fires now.
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sounds like a textbook disconnector issue
No one mentioned the possibility of soft primers The OP said firing was fine till the last brand of ammo used
I've had two different Stag/CMT made FCG that did this
I had posted about it a while ago
I found that the hammer would fall on release of the trigger
Stag was always good about replacing for free but gave no idea of why it was happening....I did find some differences in dimensions between the disconnectors but like i said it's happened to me twice
http://youtu.be/h4F7hi3-i7c this video was from my first problem I had since replaced the trigger with a new one but had the same issue last year during a class with Mike Pannone once again replaced
Last edited by PiedraFXPD; 01-19-12 at 15:48.
I have had a couple of 2 fers with my Timney Trigger but it is just a bump fire because of the light trigger pull. Wish I could do it on demand, super fast double taps would be great
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