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Message: <blockquote data-quote="HoLeChit" data-source="post: 4133776" data-attributes="member: 35036">Mine is pretty snug on an M&P upper I had handy. Typically, when i have real tight uppers/lowers I have to put them together, put the buttstock into my thigh, push the upper back like I'm pushing it into the buffer tube, and then put the pins in, in whichever order they go. That's what I just now had to do. My service rifle in the Corps was like that, and I actually always had to put my rear pin in before the pivot pin. I'm no smith, but my guess is its a combination of tight tolerances and the buffer pushing the upper forward. Hopefully that makes sense.</blockquote>