today I zeroed my Bushmaster ORC and on the 5th round it double fired. I changed the trigger springs to yellow springs from Brownell’s. I also polished the trigger parts but did not use a file or anything else. So I was surprised when it double fired. I continued to shoot with no further problems. Now what do I do. I have worked on the trigger of all my hunting rifles with no problem. I really don’t want to spend the money for an adjustable trigger if I can avoid it. By the way shoots moa at 100 yds.
Not good…even once it’s not good.
Double firing is a big no-no.
Usually they will do it sporadically until the parts wear enough when
it will become more frequent.
You may have polished somewhere more than you should have,
and inadvertently changed a dimension in the surfaces,
causing this to occur.
Is it a worn trigger group that you polished or a new one?
Sometimes on a worn trigger group, it doesn’t take too much polishing
to mess things up. I prefer to leave them alone and use good quality parts
that usually don’t need polishing, or just spring for the NM triggers/Hammer
from Armalite or Rock River.
KyAKGuy
:rolleyes: nevermind.
Ok I’ll ask the basics…
Did you screw with all the fire control parts? trigger, hammer & disconnector. Which part of the part did you polish?
Put your stock springs back in and see if it runs.
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One should NOT be polishing the trigger group internals of a stock trigger AT ALL. They do NOT work the same way as bolt guns, and simply, doubling can land you in prison.
There is a primary and secondary sear in the semi-auto rifle, and some of these “15-minute trigger jobs” are truly dangerous and can cause you some major legal problems.
I met a youngster the other day who done one of those trigger jobs and he created a single stage trigger with a 2.5 lb. pull – and not having fired a single round through it, yet!
The sears engage dependent on the position of the bar at the rear of the trigger. Extra help can change the positive engagement to neutral in one position and even negative in another. Oftentimes, the hammer will follow the bolt creating insufficient energy to pop the primer – rather than create a double or multiple, but soft primers can help to create this recipe for trouble.
Get a replacement stock trigger group and live with it, or pony up and get Geissele, Jewell or LMT. The stock trigger really isn’t bad to begin with…
That sums up the issue. You certainly aren’t the first or last person to have done this.
I couldn’t have said it better myself.
You mean there are actually people that need to own a weapon that has
a great trigger pull, but yet malfunctions in a way that could get them
placed in a federal prison? Now it all makes sense!!
Throw out the trigger parts you polished and put in new ones.
Quit comparing the AR trigger to your bolt guns. They are 2 different things.
KyAKGuy
No. I edited my reply so it wouldn’t come off as too hostile towards the OP. For all I know he has a legitimate need for a precision trigger.
What I mean is there’s too many folks that can’t shoot the stock trigger for some reason. The stock trigger is just fine for almost all applications. If someone puts a sissy trigger in his gun for competition fine. But my sense is that there are a lot of booger eaters uneccessarily changing triggers out.
Well put. 
Leave the damn gun alone and shoot the thing!!! 
.
My first 3 AR’s all had RRA two stage - my latest I went with the standard LMT single stage. It was my first single stage AR trigger, and I actually like it. Heavier than the RR two stage, but pretty darn good when compared to my PTR91 or FAL - both of them are horrible in comparison.
One should not speak of his or his buddies rifle shooting more then 1 round with 1 squeeze of the trigger. There is a very well known case in which this happened and the feds put the guy in jail. His parts where just worn out 
A personal experience comment – I have two different AR’s that I have experienced doubling while firing fast as possible pairs… happened once on my early 90’s completely stock/never taken apart Colt HBAR (maybe 2K thru it) … has happened two or three times on my MEGA lower/RRA trigger group M4orgery. My first build and the trigger kit completely drop in out of the bag. Each time I was inside 20yds firing fast pairs practicing 3gun multiple target gunning.
I figured this was due to the timming of my finger resetting the trig … No ? Don’t expect to go to jail any time soon. Harold H.
Please provide me with a list of your prison friends who are now serving time. If shooting on your own property up in the mountains was part of their crime maybe I can help them get a pardon.
Worn out? Are we talking about the Wisconsin retard with an M16 burst kit installed in a piece of shit Olympic Arms?
If that’s the case, I’m not sure the parts were worn out. I think they were working fine.
Sorry to hijack, but I’m having this issue also and so far no cause or solution. Didn’t want to start a new thread incase the Feds & anti-gunners out there are keeping count.
My newly completed M4 has a standard trigger with no polishing or tweaking done to it and I have gotten several double shots and even one tripple. Any solutions would be appreciated.
I wonder if some of these incidents are simply unintentional “bump-firing.”
(except for the guys who screwed up the FCG with their awesome gunsmithing skills, of course).
I think you REALLY need to PM Grant, gotm4 or iraqigunz for your problem and keep it on the PM commo line. 
Did you build the lower yourself? Replace the disconnector.
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Go directly to jail, do not pass go, do not collect $200.
I did put together the lower, this is my 3rd build. So possible defective disconnector? It’s all new parts. I did contact the supplier for their take on it, still waiting though.