who's more likely to have screwed up?

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greyling22

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Aug 6, 2007
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I've got a DSA zm4 lower and a stag LPK. step 1 of assembly, install the mag button. the button only fits in the hole about 1/3 of the way before it sticks. I set it aside for the moment and installed the trigger guard. that pin was a nigh impossible to insert. I had to use the vice grip method to install it. it was not driving at all.

Now this is my first lower, but these are not complicated steps. especially the mag button. so whose part is out of spec? (and no, I do not have a space gun laying around I can swap parts with to see if a different button fit the hole or vice versa)
 
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