Hole inside lower > AR Discussions

Posted: 3/2/2008 5:25:47 PM EDT

I have a small hole drilled in one of my lowers. I bought it used and I'm not able to post a pic of it. The hole is located in the rear of the shelf just behind the selector switch. It's about 1/16" in diameter 1/4" deep and is threaded. Anyone have any idea what this was for.

Posted: 3/2/2008 5:31:55 PM EDT

[#1]

If it is a Superior Arms lower- its an over travel adjustment hole.

Posted: 3/2/2008 5:33:15 PM EDT

[#2]

It is at an angle? The hole for the grip screw goes all the way through.

If it's no that, then it's either for a set screw to tighten the fit between the upper and lower or for a set screw to remove take up from the trigger, depending on exactly where it is located. Either of the above are not standard. There was a company that added something like that, can't remember the name.

Posted: 3/2/2008 5:33:15 PM EDT

[#3]

initial thought would be shred the lower. but after reading your post a few times..
its possible that your lower was, at one time, a host for a DIAS.
no big deal.

but, i could be wrong

Posted: 3/2/2008 5:33:51 PM EDT

[#4]

Quoted:
It is at an angle? The hole for the grip screw goes all the way through.

If it's no that, then it's either for a set screw to tighten the fit between the upper and lower or for a set screw to remove take up from the trigger, depending on exactly where it is located. Either of the above are not standard. There was a company that added something like that, can't remember the name.

you may be thinking of a sun devil, gen 3?

Posted: 3/2/2008 5:38:55 PM EDT

[#5]

Quoted:
initial thought would be shred the lower. but after reading your post a few times..
its possible that your lower was, at one time, a host for a DIAS.
no big deal.

but, i could be wrong

That was my first thought.

Posted: 3/2/2008 5:51:49 PM EDT

[#6]

Better location- It's actually behind the takedown pin holes. If the hole was for a DIAS would I need to destroy the lower

Posted: 3/2/2008 5:53:55 PM EDT

[#7]

Quoted:
Better location- It's actually behind the takedown pin holes. If the hole was for a DIAS would I need to destroy the lower

No, the only hole you need to worry about is a GI autosear hole... As long as that is not the hole, you are fine.

Posted: 3/2/2008 5:55:04 PM EDT

[#8]

Curious. Is the hole in a position where a srew run into it would push on the upper receiver and take out the slop between upper and lower. This is a CMP service rifle legal modification that may indicate your lower was a service match rifle at one time.

Posted: 3/2/2008 5:57:34 PM EDT

[#9]

Quoted:
Curious. Is the hole in a position where a srew run into it would push on the upper receiver and take out the slop between upper and lower. This is a CMP service rifle legal modification that may indicate your lower was a service match rifle at one time.

No, doesn't look like it would contact that part of the upper.

Posted: 3/2/2008 6:01:26 PM EDT

[#10]

What brand?

Posted: 3/2/2008 6:08:06 PM EDT

[#11]

I bet it was an old CMP lower someone had setup to tighten up the upper/lower play
with a set screw. If it is behind the take down pin holes then it will contact that part of the upper.

Posted: 3/2/2008 6:51:32 PM EDT

[#12]

picture of said hole so we can see exactly where it is in the lower?

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[ARCHIVED THREAD] - Hole inside lower

[ARCHIVED THREAD] - Hole inside lower