On my new middy the trigger pin walks out during rapid fire. Ordered a new national match pin from rock river still does the same thing. Am I doing something wrong?Thanks in advance.
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make sure the notches in the pins are being held by the hammer spring. there are notches in the pins which should be on the right side of the lower when looking into the lower with barrel pointed away from you


the hammer spring legs hold the trigger pin and the j-spring which is installed inside the hammer is what holds the hammer spring

Thanks teknic order sent.
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Olympic arms also sells pins that have a head on one side and an "e" clip on the other side.  They work well and if i remember correctly, they were like $7.00

It's usually not the pins , it will be the retaining wire in the hammer, for the hammer  or the hammer spring for the trigger These are what sit in the grooves on the pin. Clean in side the hole of the hammer  .  If that doesn't work a new hammer  will be the only fix. you should feel a click when you slide in the pin. If the trigger, check alignment of the hammer spring on the trigger pin, should be sitting in the grooves of the pin. If everything looks ok, replace the hammer spring.

Easy fix.  Put blue Lock-tight on the outside surface on both sides.  Wait one minute and wipe off excess.
Pin will not rotate or come out.