Problem with my new AR lower

Problem with my new AR lower

This is a discussion on Problem with my new AR lower within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; I decided to spend my furlough day sighting in my new AR build since I have been putting that off. My new BCM upper receiver ...

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Thread: Problem with my new AR lower

  1. #1
    Member Array beni's Avatar
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    Problem with my new AR lower

    I decided to spend my furlough day sighting in my new AR build since I have been putting that off.

    My new BCM upper receiver worked great without any issues.

    My PSA lower was another story. Things were going fine until about 20 or 30 rounds into my session when I went to pull the trigger and it would not budge. I unloaded my rifle and started inspecting the gun to see what the issue was. I then noticed that the trigger roll pin had begun to walk out of the lower receiver on the left side of the rifle. I was able to disassemble the rifle and push the pin back in. Another 20-30 rounds later the same thing happened.
    The roll pin holding in the hammer and hammer spring seemed to stay put just fine.

    Has anybody had an issue like this before with their AR? As an FYI I assembled the lower myself with a PSA LPK. Is there a certain orientation that the pin should be installed it? The video I referenced said that it didn't matter which side the pin went but didn't say whether the two dimples on the pins themselves had to go in a certain way. If it is not something like that I hope that it is the pins themselves. The roll pin for the trigger is able to go in really easy for me without needing to use a hammer or anything to get it in.


  2. #2
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    Roll pin?

    On most standard pins there is a little groove in the pin. The hammer spring rests in that groove and keeps it from walking out.

    Link to pic

    http://www.flickr.com/photos/itstact...n/photostream/

    If you look in the pic you will see how the "tail" of the hammer spring rests in a notch on the trigger pin. This is what keeps it in place. Cheers!

    Up close of trigger pin...

    hammertrigger_pin_1.jpg

    The spring will rest in the notch towards the end.
    beni likes this.
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  3. #3
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    Sounds as if the pin or hole are not the correct size. It should not matter which way it is installed. I would contact PSA and try a new pin first.
    Also double Check you installed the springs correct.
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  4. #4
    Senior Member Array Lotus222's Avatar
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    Your trigger assembly spring is in upside down. I did the same thing with my PSA build. Fix it, and the spring aligns with the grooves in the pin - and no more walking. ...Also, the hammer will drop harder.
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  5. #5
    Member Array beni's Avatar
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    Timmy thanks for the pictures they helped me realize that like Lotus said above that I installed the the hammer spring in upside down but on the correct side of the hammer. the trigger roll pin does not push out like it did and the hammer does indeed drop harder. Its funny how there is more than one way to install the hammer spring incorrectly. I was only aware of the way were the spring contacts the wrong side of the hammer. Thanks for the assistance
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    Yay! Now go get some!
    It is surely true that you can lead a horse to water but you can't make them drink. Nor can you make them grateful for your efforts.

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    Distinguished Member Array kapnketel's Avatar
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    Just learned something new. Thanks Timmy!
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    I've seen guns that had the hammer spring in upside down and had light primer strikes resulting in numerous failure to fires
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  9. #9
    Senior Member Array munch520's Avatar
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    Quote Originally Posted by dukalmighty View Post
    I've seen guns that had the hammer spring in upside down and had light primer strikes resulting in numerous failure to fires
    Yep. I had one guy bring his gun up to me bragging about how light the pull weight was first thing I looked at was the hammer spring. Sho enuf...upside down.
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