Random DIAS Question


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OneWound
July 9, 2013, 09:59 PM
Why do DIAS's only work on low-shelf receivers? Can't they be machined to fit high-shelf receivers? Sorry for the random question, was looking at them online and thought it wouldn't hurt to ask!

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crazy-mp
July 11, 2013, 12:36 AM
double post

crazy-mp
July 11, 2013, 12:44 AM
There is not enough clearance for the rear take down pins in the high shelf receivers, in theory you could machine it out so there would only be a paper thin sliver of metal there, but it most likely would only last a burst or two.

Most manufacturers will put a high shelf in a end mill and make it a low shelf if they need to, but then again if you have a license to manufacture a machine gun you would most likely would not use a drop in as a first choice only as a "test sample."

Here is a high shelf that has been milled out http://users.zoominternet.net/~m60/ar15milledlower.JPG

and here is a picture of the clearance between a high and low shelf

http://i1074.photobucket.com/albums/w417/Raeth1997/AR15-HighShelf_versus_LowShelf.jpg

and here is what a drop in sear looks like, you can see the open area in the back is where the rear take down pin would slide through

http://picturearchive.gunauction.com/1773132826/6392367/e6bc6ac9f18717e146fffd51626278f5.jpg

*none of these pictures are mine and are shown for research purposes only*

OneWound
July 11, 2013, 07:52 PM
Thanks, I knew that high shelf receivers couldn't work, just more as the why is what intrigues me. Also, wouldn't the paddle (or the part that does a lot of moving) hit the high shelf and ruin it quicker?

crazy-mp
July 11, 2013, 10:03 PM
The trip lever does not touch the receiver it sits above the safety/selector as the bolt carrier moves back forward the trip releases the hammer and will continue to fire as long as you have the trigger pulled with the M16 fire control group components.

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