AR 15 doubling infrequently
My AR 15 doubles every infrequently. I have been told if I replace the hammer and disconnector it should sholve the problem...do we have agreement? Other thoughts?
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Maybe...Maybe not. The first thing to do is to establish if there are any of the five key M16 parts inside your rifle. Any one of the five have been ruled as illegal to have in an AR by the BATFE. If any of them are there then you need to get them out ASAP because just having them in a semi auto is big trouble and having a rifle that fires multiple shots with a single pull of the trigger means bigger trouble!
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quote:Originally posted by 5mmgunguy
My AR 15 doubles every infrequently. I have been told if I replace the hammer and disconnector it should sholve the problem...do we have agreement? Other thoughts?
Thats a bit extreme if you haven't checked the firing pin spring.
Sometimes if you get a slightly out of spec pin, it will have enough inertial energy to detonate a primer. Especially a non military spec primer. Initially, there was no spring, it was put in after the fact to fix that problem.
Added, a link to fulton armory with some more details on slam fire problems with AR's.0 -
I had one that doubled, and found that if I held the trigger it would fire only once, and then when I let off the trigger it would fire again. The disconnector was binding in the trigger. I replaced the fire control parts and the problem went away. 0 -
quote:Originally posted by haroldchrismeyer
I had one that doubled, and found that if I held the trigger it would fire only once, and then when I let off the trigger it would fire again. The disconnector was binding in the trigger. I replaced the fire control parts and the problem went away.
It is possible for the fire control components to be at fault, but it is usually more than just intermittent.
I usually try the simple solution first rather than the complicated one first.0 -
You have to fit the disconnector properly.
That means the disconnector stop needs to be ground to move its' hammer engaging hook forward.
It should release the hammer at the very end of its' rearward travel as the trigger is released.
This part of trigger adjustment is especially important in fine tuning a single stage trigger having shallow engagement.0 -
Quite possibly operator error. I had this problem with one AR that had a light single stage trigger. Improper trigger technique induced a bump fire occasionally. After I relearned correct trigger control, it has not reoccurred. 0 -
Are you using factory loads or reloads? I had a problem a few years back with a SKS that had the same problem. (I know the SKS is totally diferent in action and design). The gentleman I used to shoot with downloaded his round to shoot comfortable for him and he reached that "magic" load where the action would not cycle all the way back to lock back up at times. Made for one heck of a suprise at the range!
Just trying to help to find the "smoking gun"0 -
Double checked all parts are AR 15 parts, no M16 parts...there is no spring on the firing pin...they are reloads but they are full power loads with 25.3 grains of 748 behind 69 gr sierra hps. 0 -
You could simply replace the fire control group or take it one step at a time in order of expense:
Disassemble the lower receiver and insure it's parts have not been altered or modified and that everything is assembled correctly (spring legs, etc.). All standard AR parts are straight drop-in items so there should be no evidence of any sort of 'fitting'.
Check that the disconnector spring is correcly oriented. One end has a larger diameter than the other - the big end sits downward.
Inspect the disconnector and it's channel for debris or unsusal wear indicating burrs, etc.
If no problems are noted, drop in a new disconnector spring and reassemble after cleaning everything thoroughly.
If the problem persists, first replace just the disconnector.
Next in line for replacement would of course be the hammer and trigger.
Please keep us posted so we might all learn from your problem.0 -
I'd replace the hole FCG for liability reasons.. The trigger is to light and the recoil is causeing it to bumpfire...[;)] A classic case of bumpfireing if I ever heard one.
A good chip mccormick single stage replacement trigger pack it as easy as pie to drop in and will remedy any problems you may have..0 -
Likelihood of having M16 parts in your gun by mistake is virtually nil (which is one of the big reasons the ATF comes down so harshly on those who do. . .its usually not an "accident").
The only way this is going to happen is if your gun was built or tampered with by a hack or someone clueless. No factory-made gun will have these inside.
I think the question has already been answered, but to clarify a bit more, "doubling" is a not-uncommon problem with AR-15 type guns with worn or defective fire control parts.
I haven't seen it in quite a while, but I remember that there is a segment in the AGI AR-15 gunsmithing video that specifically addresses this particular problem, going over exactly what is happening parts-wise.
The usual symptom is the gun fires when the trigger is pulled, and then again when its released.
The usual culprit is a worn or defective disconnector. Other possibilities include a defective or mis-installed disconnector spring, and a worn hammer hook.
Note that this is *NOT* the same thing as "bump" firing (which is where recoil causes the shooter to pull the trigger a second time). "Bump" firing can happen with really light trigger and/or poor trigger control.
Needless to say, with "bump" firing, the gun doesn't fire multiple times when the trigger is released, but only when its pulled.
And the solution is pretty simple. If you're "bump" firing, then you have to get better control of your gun and trigger. (Having a gun without a "hair" trigger doesn't hurt either).
If you are having problems with your fire-control group, you either replace the defective part(s), or the entire thing.
A new disconnector costs about $5-10 and isn't too hard to install.0 -
One trigger that I've never had any trouble with is the Rock River Arms 2 stage. The disconnector and spring are already in place. I've built a dozen or so AR 15s and AR 10s and never had trigger issues. For $99.00 it's an excellent value, I think. 0 -
quote:Originally posted by 5mmgunguy
Double checked all parts are AR 15 parts, no M16 parts...there is no spring on the firing pin...they are reloads but they are full power loads with 25.3 grains of 748 behind 69 gr sierra hps.
Some do in fact have springs, colt does, the schematic I listed here is from colt. There are other designs of firing pin that does not require it. However, you are free to approach the problem as you wish. I prefer to approach the simplest first before gutting various parts out of the trigger group.0
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