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Dirt and grime do not get into that hole for the firing pin retaining pin. Its a non-issue at all, but if you want that BCG, it looks good (although kinda pricey).
On a side note, if you are posting pics, try posting the pic directly instead of a link. Makes it easier to follow your thread and not have to keep clicking at each link. (just a suggestion though).
Good luck with the rest of the build. You got some nice parts on there so far. Keep it up.
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