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Posted: 10/16/2009 5:05:56 PM EDT
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So I took my brand new CMMG Mod4 SA to the range today. First good day to go sight it in.
So I fire all my weapons the same. Bring the trigger all the way back to discharge..... release trigger slowly untill the sear engages (no farther) and then back to discharge again. Well the first 20 rounds went fine. Fired them all in two, and three, round groups and adjust the sight in from there. Refill magazine.... insert into weapon..... chamber first round...... squeeze trigger to discharge.......BANG....... release trigger to sear catches BANG. Second round fires. Sear never engages.... hammer dropped on release and fired a second round. Out of 20 rounds...... this happend 6 times. My range master got behind the gun, and fired 20. No problem. But he watched it happen to me the 5 times after the first. So am I doing something wrong? Or is it the weapon? Now mind you it couldn't have been anything but the trigger (I think) because it didn't matter if I squeezed, and immediatly released, the trigger. Or if I squeezed the trigger and held it for 10 seconds, then released it. The second round would still go off. Suggestions? Anyone ever heard of this happening before? |
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Nothing in the fire control. Inspected around the hammer, trigger, all the springs, and safety. Not obstructions. There do seem to be quite a few of what I would call metal shavings, or metal fileings. About 20 or 30. Ranging from little specs to a 1/4 inch long. That could be normal wear as far as I know. Nothing that I would consider to be causing my problem.
My range master is a Colt m16/AR15 armor. He opened it up and visually inspected the fire control (without removing any parts) and said that he could visually see nothing wrong. |
| Why are you holding the trigger rearward until it cycles then realeasing the hammer to the sear?you hear a click right and then squeeze?You do that when manualy cycling as a function check not when your shooting..squeeze and release,you could be inducing the failure yourself.The disconector is suposed to catch the hammer and release to the sear..your holding back the trigger so the hammer is held by the disconector and then releasing to the trigger sear and maybe thats why it skipped your interupting the cycle.I re read the post sounds like the disconector isnt catching the hammer,try pushing back and forth on the disconector and see if it moves freely with in the trigger..could be the disconectors spring or something impeding the disconector itself. |
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I'm just doing what I've been trained to do by every firearms instructor I've had over the past 12 years I've been in law enforcement. It's the same way I've fired every weapon I've ever had, Including Colt, Bushmaster, and DPMS AR's. It's certianly never been a problem with any other gun I've ever fired.
And I'm going to do exactly what CMMG tells me to do. Which means I'm not going to do anything and wait for the new Fire Control Group. They know better than anyone what the problem is, and how to fix it. |
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It's not the disconnector as it's firing a second time after you let off. The Disco has already done its job.
The problem is with the hammer/trigger engagement which is also why you can't see anything wrong. You can't see that engagement point withe FCG installed. Install the new FCG. |
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disconnecter/ spring can do some wild things please look at them !
It's not the disconnecter as it's firing a second time after you let off. The Disco has already done its job. The problem is with the hammer/trigger engagement which is also why you can't see anything wrong. You can't see that engagement point withe FCG installed. Install the new FCG. |
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Is it a "match" trigger of some type? Were you holding the rifle tight into your shoulder? I've seen people "bump fire" match trigger before by accident then argue the rifle was doubling. a sure clue is if it does it to you but not to other shooters. It's not match grade. Unless CMMG puts a match grade in from the factory. |
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Is it a "match" trigger of some type? Were you holding the rifle tight into your shoulder? I've seen people "bump fire" match trigger before by accident then argue the rifle was doubling. a sure clue is if it does it to you but not to other shooters. It's not match grade. Unless CMMG puts a match grade in from the factory. if they put thier 2-stage trigger in it you would have known this due to price. The obvious solution is that they give one of the 2 stage to replace the defective trigger group. 
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UPDATE!!!!!!!!!!!!!! Here was my response from CMMG this morning.
Craig, It sounds like a disconnector issue. Check the the trigger under thedisconnector for a spring, it is probably damaged or missing. I can sendyou one or have a return shipping label sent to you and we can replace it. Thank You,Garson ––Technical SupportCMMG Inc. P.O. Box 369Fayette, MO. 65248 660-248-2293 ext. 73 660-248-2290 Fax www.cmmginc.com So much for the new Fire Control I guess. |
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Update!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
So CMMG sent me a return shipping lable. It took me almost a week to get the lower sent back off to them. (personal issues) So on Monday, I send my lower to CMMG. On Wednesday, 10/28, it arrived to them. On Wednesday evening it was back out on the way home. Friday I recieved my lower with a brand new fire control group. This is the most amazing customer service I have ever had, with anything, not just a firearms manufacturer. CMMG....... you have certianly earned my repeat business. Now to go and make my own decisions on the piston/DI debate. :D Everyone needs to go buy a CMMG today!!!!! |
| maybe the disconnector is like 1/1000 too short letting the hammer fall if the trigger is released slowly, id definitely get it replaced. if u release the hammer quick it wouldnt fire, but doing it slow would. of course it could be just long enough to catch and maybe after the disconnector caught, u pulled the trigger ever so slightly and fired it. |
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Did I read this wrong? Your rangemaster did not have the problem......but you did? I would tend to think your style of slowly releasing the trigger caused the issue. Not sure it is the FCG.. I have the feeling that it was a problem with the FCG that CMMG has had before. They immediatly knew what the problem was, changed the FCG, and sent it back the same day. The FCG that's in the lower now looks a little different, and the problem does NOT happen with the new part. I have a hunch that this is a problem that CMMG has had in the past. |
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Update!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! So CMMG sent me a return shipping lable. It took me almost a week to get the lower sent back off to them. (personal issues) So on Monday, I send my lower to CMMG. On Wednesday, 10/28, it arrived to them. On Wednesday evening it was back out on the way home. Friday I recieved my lower with a brand new fire control group. This is the most amazing customer service I have ever had, with anything, not just a firearms manufacturer. CMMG....... you have certianly earned my repeat business. Now to go and make my own decisions on the piston/DI debate. :D Everyone needs to go buy a CMMG today!!!!! A manufacturer sent you a problem piece then fixed it? I would say that scores well below sending a good piece in the first place. Your excitement would be appropriate if they had given you a free upgrade or something in exchange for your trouble. |
| how come everyone wants something better for free? the op had a problem with the fcg cmmg fixed at no cost to him. what the hell else would you expect? Oh sorry there was a problem with you fire control group here is a new gold trigger!!! Then people would bitch because they didnt get it fast enough or something stupid like that. Also it shouldnt matter how slow you release the trigger if everything is working correctly. Thank you CMMG for the awesome customer service. |
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how come everyone wants something better for free? the op had a problem with the fcg cmmg fixed at no cost to him. what the hell else would you expect? Oh sorry there was a problem with you fire control group here is a new gold trigger!!! Then people would bitch because they didnt get it fast enough or something stupid like that. Also it shouldnt matter how slow you release the trigger if everything is working correctly. Thank you CMMG for the awesome customer service. QFTMFT people will bitch just to be bitching, kind of like a lot of women. |
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A manufacturer sent you a problem piece then fixed it? I would say that scores well below sending a good piece in the first place. Your excitement would be appropriate if they had given you a free upgrade or something in exchange for your trouble. While it's certainly better to get one that works right from the beginning, every manufacturer squeezes out a turd once in a while. That's when the quality of the company becomes apparent. So long as the problems aren't too frequent, I'd rather get a gun from a company that backs up their product. |
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A manufacturer sent you a problem piece then fixed it? I would say that scores well below sending a good piece in the first place. Your excitement would be appropriate if they had given you a free upgrade or something in exchange for your trouble. While it's certainly better to get one that works right from the beginning, every manufacturer squeezes out a turd once in a while. That's when the quality of the company becomes apparent. So long as the problems aren't too frequent, I'd rather get a gun from a company that backs up their product. Fortuanetly in the AR world that is nearly all of them |
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