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Rimfire Firearms .22, .17 and other Rimfire Handguns and Rifles

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  #1  
Old 05-01-2013, 2:43 PM
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Default Purpose of the extra hole on the side of the AR15 front takedown spring hole?

On an AR15 lower receiver, there is a hole for the front takedown pin detent spring. About an inch back there is a hole that goes directly into the lower and ties into the spring hole. What is the purpose of this? All lowers I have seen have it.

I've used it to hold the spring back and assist removal of the pivot pin but not sure if that is what it is used for.
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Last edited by NickTheGreek; 05-01-2013 at 2:47 PM..
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Old 05-01-2013, 2:52 PM
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I used it to hold the spring back when I installed the takedown pin. Seems like that's why it is there. Works for removal too.
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Old 05-01-2013, 5:19 PM
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Drain hole to prevent moisture from rusting spring?
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Old 05-01-2013, 6:49 PM
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Drain hole to prevent moisture from rusting spring?
I've heard that one before too. Just seemed strange to me.
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Old 05-01-2013, 6:50 PM
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Vent hole to prevent the plunger from becoming locked against the pin by moisture/oil/dirt buildup.
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Old 05-01-2013, 9:06 PM
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From the comments, and what I have read on other sites, it sounds like it's a multi-function hole. Those tend to be my favorite holes.
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Old 05-02-2013, 4:02 PM
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From the comments, and what I have read on other sites, it sounds like it's a multi-function hole. Those tend to be my favorite holes.
This from a Greek.Be careful.
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Old 05-09-2013, 2:12 PM
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This from a Greek.Be careful.
Lol
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Old 05-12-2013, 2:37 PM
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It's to insert a pin to hold back the spring during assembly of the front pivot pin.

Not sure why it's still there, nobody I know uses it (and I never have, even in school a hundred years ago), since there are easier and faster ways of keeping the spring and detente immobile while putting in the pivot pin.
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