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AR gone auto on me
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 Posted: Fri Feb 24th, 2017 08:30 PM
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sanford
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I have a cmmg 16in chambered in 556, never had any problems with it,only thing I have done to it was add a cmmg 2 stag trigger about 2 yr ago, also it is the piston type. Cleaned it good and has been put up about 6 months,took it out yesterday and ran a 10 rd mag before I knew what was going on, took it apart do not see anything, thought maybe got so soft primers with the factory ammo so I went back today and it did it with all ammo just intermittent. All ammo is factory,function checks correctly,trigger group looks good, going to take bolt carrier group back apart and make sure firing pin isn't hanging up. Was hoping someone could give me some advice as what to look at next, as always thanks for any help



 Posted: Fri Feb 24th, 2017 09:29 PM
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ghrit



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Have a look at the disconnector, see that it's moving freely and engages the hammer when the bolt goes full travel. IF IT DOES NOT, you need to get it fixed pronto.

Here's what is supposed to be happening.
https://www.youtube.com/watch?v=WSqYvWib1og



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 Posted: Fri Feb 24th, 2017 10:32 PM
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sanford
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Hey ghrit, disconnect looks to be working properly, doesn't look worn or chipped, functions everytime bolt is pulled back. Thanks for the reply



 Posted: Fri Feb 24th, 2017 10:46 PM
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Snuffy
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Is it going full Auto or more of a double tap?

I agree with ghrit, disconnector. I had one I thought was slam firing, but would only do it when you "rode" the trigger to reset, was actually double tapping. If you just released the trigger quickly, the disconnector would catch the hammer.

Remove the upper from the lower. Pull the trigger and release the hammer, while still holding the trigger back, reset the hammer, then slowly let the trigger forward. See if the disconnector catches the hammer or let's it go. Now repeat the above, but release the trigger quickly and see if the disconnector catches the hammer.

I had to remove a little metal from the front underside of the disconnector to make it engage properly.



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 Posted: Fri Feb 24th, 2017 11:51 PM
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sanford
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I will recheck it like you say. It was very sporadic today, one shot would be fine, the next shot might run 4 rounds until I released the trigger, the next might just double tap and stop even though I had not released the trigger. Thanks



 Posted: Sat Feb 25th, 2017 12:18 AM
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sanford
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Hey there snuffy, I did it the way you suggested several times each time the disconnect is catching, I checked the bolt carrier to see if the firing pin could be sticking all looks to be ok, if you have any more suggestions I am all ears. Thanks



 Posted: Sat Feb 25th, 2017 01:02 AM
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ghrit



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sanford wrote: I will recheck it like you say. It was very sporadic today, one shot would be fine, the next shot might run 4 rounds until I released the trigger, the next might just double tap and stop even though I had not released the trigger. Thanks Something is amiss with the timing, methinks.  The disconnector should catch no matter how fast you release the trigger.  Look to the bolt doing full travel and that there isn't too much wear on the underside of the bolt or the top surface of the disconnector.  A cheap fix is a new disconnector,  I'm still thinking that's at the root of the problem.



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 Posted: Sat Feb 25th, 2017 01:24 AM
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RobertMT
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Check disconnector spring, it's likely worn.

http://media.midwayusa.com/productimages/880x660/Primary/407/407819.jpg

Also check how much engagement disconnector has with hammer, if it's catching hammer, but when you reset trigger and disconnector releases, sear should catch it, if not, replace trigger group, is the best course of action.

If you want to upgrade, ALG makes decent trigger and ships free. QMS is polished standard trigger ($49), ACT is Upgraded ($69).
https://algdefense.com/quality-mil-spec-trigger-qms.html

Several places have them on sale for less, but by time you pay shipping, they end up costing more.



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 Posted: Sat Feb 25th, 2017 01:29 AM
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Snuffy
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ghrit wrote:
sanford wrote: I will recheck it like you say. It was very sporadic today, one shot would be fine, the next shot might run 4 rounds until I released the trigger, the next might just double tap and stop even though I had not released the trigger. Thanks Something is amiss with the timing, methinks.  The disconnector should catch no matter how fast you release the trigger.  Look to the bolt doing full travel and that there isn't too much wear on the underside of the bolt or the top surface of the disconnector.  A cheap fix is a new disconnector,  I'm still thinking that's at the root of the problem.


ghrit, in my case the disconnector was catching, it just wasn't allowing the sears to engage, if you rode the trigger to reset. Its like you said a timing issue. A small amount of filing on the front underside of the disconnector, allowed it to hold the hammer, just long enough for the trigger sears to fully engage.



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 Posted: Sat Feb 25th, 2017 01:38 PM
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sanford
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Thanks guys for the help, greatly appreciated, think will just drop a new trigger group in and be done, again thanks



 Posted: Sat Feb 25th, 2017 01:44 PM
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RobertMT
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I would agree, that's safest option. I wouldn't hold onto worn trigger, it could get you in hot water, people have gotten in bind for less.



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 Posted: Sat Feb 25th, 2017 02:16 PM
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Rockydog



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Whatever you do don't take it to a public range unless you know that it is fixed. IIRC there was a big story over a guy who loaned a rifle to a friend knowing that it had a problem. The friend had a problem with the rifle and was turned in to local authorities for shooting a full auto. The friend was not charged but the owner was. He served 30 months in prison for "Transferring" a full auto firearm to another. RD

http://firearmscoalition.org/index.php?option=com_content&view=article&id=775:the-accidental-felon&catid=19:the-knox-update&Itemid=144

Edited after finding the details of the story. RD



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 Posted: Sat Feb 25th, 2017 02:42 PM
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swampratt
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I had an sks that had less than 30 rounds through it..I got it in cosmoline and cleaned it all with transmission fluid then removed the trans fluid.

Only time it would empty the 10 round magazine was when i was gently easing back on the trigger. if I pulled the trigger quick it would not do it.

I thought that the easy pulling allowed the trigger to remain in a 1/2 pulled state and so i would get the full auto.
ZZZT less than 1/3 of a second it seemed to empty 10 rounds



 Posted: Sat Feb 25th, 2017 04:02 PM
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A pause for the COZ
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Rockydog wrote: Whatever you do don't take it to a public range unless you know that it is fixed. IIRC there was a big story over a guy who loaned a rifle to a friend knowing that it had a problem. The friend had a problem with the rifle and was turned in to local authorities for shooting a full auto. The friend was not charged but the owner was. He served 30 months in prison for "Transferring" a full auto firearm to another. RD

http://firearmscoalition.org/index.php?option=com_content&view=article&id=775:the-accidental-felon&catid=19:the-knox-update&Itemid=144

Edited after finding the details of the story. RD

Pretty crappy to just throw him under the bus like that. Plus a dumb arse to loan a gun with a known safety issue.
Sounds like both sides of that stream were polluted.

I did not know you could be found guilty of a crime for a defect in a tool.
I hope with Trump we get a better class of US Attorneys into the mix.
They make a case solely because they want and can make a case. Scary really.
Under Hillary I totally expected to be labeled a threat.
She already has us down as deplorable s.

This rolling fast and loose with the Law lends it self to corruption.
Imagine if the FBI used the same strict interpretation of the law with Hillary's email server.
The only reason Comey did not recommend charges ( Stated reason any way) Was that he could not prove intent. She broke the law for sure, but he stated she did not mean too so no charges.
Really?? Sorry about the straying off topic but that stuff P.O's me.

Last edited on Sat Feb 25th, 2017 04:16 PM by A pause for the COZ



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 Posted: Sat Feb 25th, 2017 04:51 PM
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Snuffy
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sanford wrote:
Thanks guys for the help, greatly appreciated, think will just drop a new trigger group in and be done, again thanks

Let us know if that corrects the problem.



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 Posted: Sun Feb 26th, 2017 07:11 PM
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Paul B
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Back when Clinton's AWB was in effect and AR's were bring in big bucks, a guy at a gun show had a Colt SP-1 Sporter on his table for $1,000 with 1,000+ rounds of ammo. Should have smelled something wrong but what the hell when AR's around here were pulling up to $2,500 I'd probably make out on the ammo which was commercial reloads.It also came with two dozen 30 round magazines.
Well, I took it to the range and brrrrrp! about five rounds and then a jam. Cleared the jam and three more rounds full auto and a jam. WFT?????
I quickly put it away and played with another rifle for a while, then went home. I took it to the next gun show and talked with a guy whose business was custom AR's and replacement parts. He says company ;policy would not allow him to repair my rifle at the show but he did tear it down and sure enough, the guy that sold it to me had tried to convert it to full auto and screwed things up. The guys who looked and the rifle said, To hell with company policy, this thing can put you in prison." and proceeded to replace all the apparently altered parts which he returned to me with the suggestion that they disappear. They now reside buried deeply in the Tucson landfill. FWIW, that ammo shoots just fine. The AR? Long gone. I never did like the style and design anyway so I sold it at a handsome profit. :cool::thumbs:
Paul B.



 Posted: Mon Feb 27th, 2017 12:35 AM
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sanford
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New trigger group is in check it out tomorrow



 Posted: Mon Feb 27th, 2017 01:42 PM
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I installed a Jewell AR trigger on my AR. It would double-tap. Only fix was to replace Jewell trigger with mil-spec. No problems after that. And yes, semi-auto rifle going full-auto can get you into trouble.



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 Posted: Mon Feb 27th, 2017 02:26 PM
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SavageShooter



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Regardless of what's causing the issues, this rifle sounds like a keeper to me! I'd build another one for shooting and keep that baby in the safe for SHTF moments.



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 Posted: Mon Feb 27th, 2017 04:47 PM
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Ozark Ed



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Yeah, I thought AR stood for Automatic Rifle, and 15 was the number of magazines you could dump in a minute.



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