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Posted: 6/23/2017 9:57:17 PM EDT

So I was wondering what would cause an issue I'm having. To preface that I have a cmmg lpk and the trigger is installed correctly. The rounds are ejecting and reloading correctly the problem I'm having is the trigger is not resetting so I have to charge the charging handle and then it will fire one round and eject reload next shell nothing on the trigger reset. Any suggestions?

Posted: 6/23/2017 9:59:37 PM EDT

[#1]

Might want to check if the trigger group is installed correctly. I might even contact CMMG about this. They have excellent customer service. Does the trigger reset properly when you rack/ dry fire it?

Posted: 6/23/2017 10:03:19 PM EDT

[#2]

Check that your disconnector spring is installed fat end down, inside the trigger.

Posted: 6/23/2017 10:44:06 PM EDT

[#3]

Springs are installed backwards.

Posted: 6/23/2017 11:38:58 PM EDT

[#4]

Had the same problem with a new build recently. Eveything was installed correctly but trigger wouldn't reset unless I pushed it forward with my trigger finger. Disassembled the fire control group and discovered that the disconnector hook had a burr on the edge where it catches on the back ledge of the hammer (see drawings). Removed the burr with a file and polished both disconnector and hammer where they touch and everything runs perfectly now.

Attached File
Attached File

Posted: 6/24/2017 9:54:15 AM EDT

[#5]

Thanks I will try that yes everything was installed correctly it worked perfect the first 40 rounds then started acting up it works perfect racking by hand

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[ARCHIVED THREAD] - Build question

[ARCHIVED THREAD] - Build question