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Bradford Perry from United States, NM Public Profile
Either I got the first SI magwell that doesn't fit right directly out of the box or these are nearly a no-go for the pf940c 76% frames. I got it installed, but I had to use a combination of strategic filing, and my body weight to get it seated correctly to accept the retention screw.
If you're using an 80% frame you're probably good to go out of the box (all of mine were), but if it's a 76% maybe explore other options unless you don't mind a little bit more fit and finish work.
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