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Posted: 4/22/2016 5:44:59 PM EDT
Gibbz G4 Upper is a little sloppy in my Seekins SP 223 lower. Going to adjust the set/alignment screw and see if that helps

Link Posted: 4/22/2016 5:49:48 PM EDT
Don't worry about it and shoot it.
Link Posted: 4/22/2016 6:59:59 PM EDT
If it has one of these then that is precisely what it is for.

Link Posted: 4/22/2016 8:01:41 PM EDT
That's part of the reason why I love cerakote.

I lightly sand the bolt pin recesses and the pins and after a few tries, there is tension and no play between the upper and lower.
Link Posted: 4/22/2016 8:17:24 PM EDT
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Originally Posted By ARgonot:
If it has one of these then that is precisely what it is for.

http://www.joeboboutfitters.com/v/vspfiles/photos/SKN-SP223Lower-Gen2-4.jpg
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Yea, tried that, no joy. It seems to either be bottomed out or stuck, but will go further in. It will loosen, but go no further
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