Safety selector/trigger issue on 80 percent lower

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  • Kyza669

    Plinker
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    Jul 3, 2021
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    Texas
    Hey guys, so I’m brand new to machining and building guns. This is my first time and I got a 80 lower with the 80 arms router and easy jig gen 3. Followed directions to a T. After cutting, went to build my newly cut 80 lower(billet) with a PSA build kit.
    however upon installing the trigger with safety selector and hammer cocked back. I could not switch it to safe. But when I remove the trigger, the selector works just fine.
    I assumed cutting issue, lubed everything, removed detent and spring and tested selector by itself.
    many thoughts on what the issue is and how to fix the issue?
     

    Kyza669

    Plinker
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    Jul 3, 2021
    5
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    Texas
    Also I took the hammer out before that pic since I deduced the hammer didn’t matter if it was cocked back or not. It still did this same thing
     

    gmcttr

    Grandmaster
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    May 22, 2013
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    Also I took the hammer out before that pic since I deduced the hammer didn’t matter if it was cocked back or not. It still did this same thing
    That's fine for a photo, but put the hammer back in to figure out where parts hitting. The hammer has to be in and cocked for the safety to go into the safe position.

    Has to be out of spec lower parts or out of spec machining on the lower.

    Put it back together, get out your flashlight and study it carefully. Most likely your hole spacing is out of spec, the trigger pocket isn't milled deep enough, etc.
     

    BiscuitsandGravy

    Future 'shootered'
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    If it were me... I would clean everything with brake cleaner and let it dry. Then, either take a lit candle and put a layer of soot over everything that may interface/touch with each other. What you are doing is applying the soot so you can see where things interfere/touch. Carefully put it back together as to not rub off the soot. Get it to jam or whatever very carefully and take it back apart to see where its rubbing. A red sharpie also is good for this. YMMV.

    Compare it to a known good factory lower. I'm with gmcttr, you havn't made enough chips yet.

    -B&G
     

    ditcherman

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    I’d bet the pocket is not milled deep enough.
    Once in a while it seems I’ll have a bar (area of trigger under the selector) that’s thicker than some and will give some trouble.
    Not sure about that jig, but hole could be drilled to low but that be my last bet.
    Check depth of pocket, easy fix if that’s it.
     

    Squirt239

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    Jun 7, 2010
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    I'd check the area I pointed to.

    If the trigger is not down far enough in the back it can cause issues. Also, if the rounded area is not cut far enough back (towards the stock), can also cause binding issues.

    For giggles, you may check the safety select hole for burrs as well.
     

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    JJ6187

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    Jan 7, 2021
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    New Salisbury
    I third that it looks like it isn’t deep enough yet. Never used the candle method but I’ve used plenty of blue sharpies on shiny parts.
     

    bwframe

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    As CM mentioned early in the thread, probably best to separate issues before proceeding.

    Try a known good lower parts kit that's been ran more than once, in a working gun.
     

    Kyza669

    Plinker
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    Jul 3, 2021
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    Texas
    Awesome that there’s so much help on this site!
    and yeah so how deep is it supposed to be? I googled and found 1.249 in specific
    I didn’t have calipers but I took a toothpick and got a measurement of 1.25
    Can a .01 or .1 make this problem?

    I see where the safety selector has grinding from the trigger rubbing against.
    I planned on getting a already killed lower to compare to.
    Is there any such thing as a trigger that adjusts in height?
     

    ditcherman

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    In the country, hopefully.
    Awesome that there’s so much help on this site!
    and yeah so how deep is it supposed to be? I googled and found 1.249 in specific
    I didn’t have calipers but I took a toothpick and got a measurement of 1.25
    Can a .01 or .1 make this problem?

    I see where the safety selector has grinding from the trigger rubbing against.
    I planned on getting a already killed lower to compare to.
    Is there any such thing as a trigger that adjusts in height?
    The trigger is not supposed to move, or at least not much. I think if they made adjustable (like this) triggers, people would be doing stupid stuff. When the selector turns it is supposed to hold the bar down (trigger held forward).

    .1 can certainly be a problem but I don’t think .01 should. Big difference.

    If you’ve measured and don’t think there’s a problem (albeit without calipers) then do what others have suggested, put these parts in a lower that works and put parts that work in this lower and see what happens.
     

    rb288

    Sharpshooter
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    Apr 14, 2019
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    Grovertown
    I had the same problem with one of my 80% lowers.
    It turned out my back trigger hole, the one that holds the bottom piece was cut just a bit to high, causing it not to drop out of the way when the trigger was cooked, so it was binding on the safety.
    As was said before, the safety will not work if the trigger is not cocked.
    I "enlarged" the holes a bit and used anti walk pins to secure it.
    Worked perfect after that.
     
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