Trouble with CMC drop in trigger Ruger AR

Hmm. That sucks. I guess now we know why the weight was so high with the last trigger...
That is not an easy repair.
The easiest would be to return the awesome trigger pack that is my favorite to use, and get a normal pieced trigger.
The LaRue or ALG something or another, I can’t remember, I like cartridge triggers.
Then it will at least go in. Whether it improves the pull or not will remain to be seen.

You can’t drill the trigger bushings and I wouldn’t drill the lower. You can, but I wouldn’t. Bare aluminum does not wear well.

I wish I had a better answer...

I'm not familiar with the product, but have you tried installing it both cocked and uncocked?

Never saw that before.

Have you tried the trigger in a different lower? If it fits another lower then you will know that the Ruger lower is out of spec.
I’ve used Rise ArmAment triggers and never had trouble.
https://aimsurplus.com/rise-armamen...erformance-blade-trigger-with-anti-walk-pins/

Gunny is probably right in suspecting the lower being out of spec.
I have the same trigger and had no trouble installing it, in a Windham lower I think but I am not home so can't check.

I’m betting the lower is out of wack and the trigger is fine.

Well... that just sucks.

I'd be sure to post a review, mentioning the Ruger issue, so others are spared your issue.

SRSTAdam21 said:

Anyone have issues with these?

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I've installed / used close to a dozen and never had an alignment issue.

GunnyUSMC said:

Have you tried the trigger in a different lower? If it fits another lower then you will know that the Ruger lower is out of spec.

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cdb1 said:

I’m betting the lower is out of wack and the trigger is fine.

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This.

Is the inside of the lower round or squared? If it’s round and your cmc is squared, there’s your issue. Seen it before.

Are the takedown and pivot pins hard to get out?
I had one that I tried to put put a Franklin trigger in. The trigger would go in but the selector was locked up. After three tries I put it in one of my extra lowers I had and it worked perfect. Back in the Ruger, locked up.
The takedown and pivot pins had to be knocked out with a hammer and punch. Not half way through and then pulled out with your fingers. All the way out.

Don’t get rid of it if you don’t have to. They really are worth it.
If you are upgrading triggers, I have a feeling that won’t be the only AR you ever have...
I thought I only wanted one.

Measure your trigger pin holes and verify if the Ruger is out of spec. If it is then call Ruger and ask for another lower.

A traditional trigger like a Geissele or LaRue or Schmid tool nickel teflon would probably still work. The cmc housing not playing nice with your lower
https://www.brownells.com/rifle-par...rigger-assembly-nickle-teflon-prod120778.aspx

You can do a reduced weight spring kit with a traditional trigger set up.

If the rifle was purchased new it doesn’t matter how much was paid for it. I wouldn’t dream of doing anything other than sending it to Ruger for a new one. Just because a Ruger OEM trigger was made to fit doesn’t mean a hill of beans. One of the salient features of the AR-15 platform is it’s modularity and the OP’s lower isn’t.

I was having alignment issues with a Rise Armanents drop in trigger. I could get one hole or the other lined up and the pin would go in. The other pin wouldn't fit till I hit it in with a Mallett. Went right in and trigger works PERFECTLY.

I put the CMC single stage cartridge trigger with the flat blade in a Palmetto State Armory (PSA) lower without any issues. I did not try fitting it in my Ruger AR556. My guess would also be that the problem lies with the Ruger lower.

PSA currently has their two stage nickel boron trigger on sale for $69.99. That is a pretty nice trigger. I currently have it in my Colt LE6920. It is not quite as light as the CMC single stage, but much lighter than the Ruger AR556 single-stage mil-spec type trigger and it has much less creep. Either that or a LaRue might be your best bet.

I have a Ruger 556 lower that I put a Timney Trigger in last fall. No problems and the trigger hole lined up perfect.

Are Ruger AR's mil spec ?
I thought traditional hand grips didn't fit Rugers ... I may be wrong.

ford8nr said:

Are Ruger AR's mil spec ?
I thought traditional hand grips didn't fit Rugers ... I may be wrong.

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They are mil spec. But if you compare different lowers you will find that some are cut a little different on the inside where the takedown pin goes.