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Picked up my ACR yesterday and got a chance to to put 200rds down range. First two magazines and absolutely no issues. After that every 3 to 4 rounds the trigger would not reset. I needed to manually pull the trigger forward or slap the rifle. To me this does not seem like a "break in period" issue. Took the rifle home pulled out the trigger pack and I didn't see any burs or binding. I did about a 100 functions checks and could not get the rifle to repeat the issue I had on the range. Has anyone else had a similar problem?
 

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My friend's AR-10 had the same issue. I had to slap the side of the gun to get the trigger to reset and sometimes the trigger could not be pulled to the rear. When I took the lower apart I found out that someone had installed the trigger spring in the gun improperly. The spring was blocking proper engagement of the hammer and trigger. Instead of the trigger spring engaging the trigger from the bottom it was laying over the top of the engagement surface on the trigger, if that makes sense.

I reinstalled the trigger spring properly and the issues were solved. Take a look at your trigger spring. Have you installed an aftermarket trigger?
 

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If nothing else strip the trigger pack down and degrease it. Relube, reassemble and see what happens.
 

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If nothing else strip the trigger pack down and degrease it. Relube, reassemble and see what happens.
or get a Geissele... It's still an option.
 

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is anybody out there selling, a drop-in (pre-packaged) two stage trigger for the ACR? I rather not have to mess with install all the parts and springs
 

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Not sure but I know both RRA and Geissele triggers will work in the ACR. Also Geissele is coming out with a Super ACR this month but still says "Available in March 2011!" Not sure if it is a drop in, but it's really not hard to install the non drop ins. If you are not confident with something like that, take it to a gunsmith and the cost should not be high at all if he knows what he is doing(or she).


 

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is anybody out there selling, a drop-in (pre-packaged) two stage trigger for the ACR? I rather not have to mess with install all the parts and springs
I'd still recommend doing it yourself with any trigger kit out there. It's not hard at all. And, it'll give you more insight as to what's going on in there when you pull the trigger. According to my wife there is a leprechaun with a shillelagh in there that makes the rifle go 'bang'. The RRA triggers are good as are the Geisselle triggers and others of that design are such that you don't even have to fiddle with lining up a separate disconnector so it's even easier.
 

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I'd still recommend doing it yourself with any trigger kit out there. It's not hard at all. And, it'll give you more insight as to what's going on in there when you pull the trigger. According to my wife there is a leprechaun with a shillelagh in there that makes the rifle go 'bang'. The RRA triggers are good as are the Geisselle triggers and others of that design are such that you don't even have to fiddle with lining up a separate disconnector so it's even easier.
+1

In the standard AR there are only 8 parts (springs, pins and everything) The ACR adds the safety detent that is connected to the hammer spring. It looks confusing, but with the proper procedure is very easy to assemble. Plenty of DIY vids out there to show you the proper way of doing it. I remember the 1st time I tried it and was scared to death. But it worked just fine and wouldn't hesitate to break down an ar / acr trigger group again.
 

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I actually had this happen with mine as well. Still have yet to pull the pack. There really doesn't look as though there's anything wrong in there. I will add that the group reset after I cycled the safety. I wouldn't mind seeing this thread develop further as it is very informative to someone like me who, like DSM's wife, thinks there's a "leprechaun with a shillelagh" doing all the work in there.
 

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Boy, am I tardy to this party.
I had the same problem and tracked it down to the spur on the trigger bar that engages the hammer prior to reset. I filed down both surfaces a tiny bit (3 turns each, with the coarse file in my Gerber multi-tool), and the problem seems to be resolved.

Also, I noticed that it only happened if I waited to reset until after the rifle cycled. If I reset my trigger during recoil, there's enough movement to avoid it getting stuck.
 

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I actually haven't been able to duplicate the issue since I pulled everything apart and reassembled... how many years ago? 3? How time flies.
 
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