I just installed a Rock River trigger in my Norinco M4. The old one came out and the new one went in 20 minutes. I followed the step by step on this web site:
http://www.ar15.com/forums/topic.html?b=3&f=4&t=226782
But, after installation, it would not work. I figured out the problem and solved it.
The trigger has a “tail” at the back with a flat surface on it. This tail rises when the trigger is pulled and hits the shaft of the safety selector. There is a notch in the shaft that faces down, towards the flat trigger tail plate when in the “fire” position. The tail plate rises up into that notch. When the safety is turned to “on”, the tail hits the shaft and the trigger cannot be pulled far enough to fire the rifle.
The problem was that the notch in the safety shaft was not wide enough to accommodate the trigger tail plate. A few licks with a file made the notch a bit wider, and now it works.
The better way to have solved the problem would have been to narrow that tail plate, but by the time I identified the problem, the trigger and hammer were installed and I did not want to tempt fate by taking them out again.
The trigger pull is light and crisp. I am delighted.
Nice to know American parts drop into (almost) into the Norinco M4. Only one more change planned - to float the barrel. I only intend this as a CQB toy, so improved accuracy is not really required, but I am just intrigued to see how it will shoot.
http://www.ar15.com/forums/topic.html?b=3&f=4&t=226782
But, after installation, it would not work. I figured out the problem and solved it.
The trigger has a “tail” at the back with a flat surface on it. This tail rises when the trigger is pulled and hits the shaft of the safety selector. There is a notch in the shaft that faces down, towards the flat trigger tail plate when in the “fire” position. The tail plate rises up into that notch. When the safety is turned to “on”, the tail hits the shaft and the trigger cannot be pulled far enough to fire the rifle.
The problem was that the notch in the safety shaft was not wide enough to accommodate the trigger tail plate. A few licks with a file made the notch a bit wider, and now it works.
The better way to have solved the problem would have been to narrow that tail plate, but by the time I identified the problem, the trigger and hammer were installed and I did not want to tempt fate by taking them out again.
The trigger pull is light and crisp. I am delighted.
Nice to know American parts drop into (almost) into the Norinco M4. Only one more change planned - to float the barrel. I only intend this as a CQB toy, so improved accuracy is not really required, but I am just intrigued to see how it will shoot.
