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ETA: Big W, is your mag button on backwards?
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Never really thought about it. I used the guides from Brownells when I built the lowers, and it didn't specify. Neither did the guide I looked at here.
Guess I assumed (incorrectly) the grooves were there to catch the spring, instead of to provide a gripping surface. It installs either way with no problem, and they've all functioned just fine.
Guess I know what I'm doing for the next hour...reversing a dozen mag release buttons.
And just for comparison to the Ident engraving...here's the first one I ever got back, where the manufacturer did it at no charge before they anodized the lower.
They also marked one PISTOL for me (yes, I'm well aware it's not required, just thought it may save some headache with LEO one day):
(And notice I'm consistent with the mag releases
)