AR-15 Measurements

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pdcrig

pdcrig

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I just got in my AR upper yesterday and put it on my lower and I've got lots of slop. The uppper is DS Arms and the lower Tactical Innovations. Apart, they are both very well made and finished but they are just too lose together. What should the width measurement be on the front pivot pin stud of the upper and the corresponding pivot pin notch in the lower? How do I cure this? Thanks.:grumble:
 
KurtM

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"Upper to lower fit is completely irrelevant to function or accuracy" Lilly'sDad

True to a point, as long as the rear of the receivers line up fairly well, If they don't you can wear the heck out of the buffer tube/lower receiver ring...just like the piston guns do. Or the bolt carrier can bang into, or drag on the sides of the buffer tube causing malfunctions.

As long as when you rack the bolt back by hand you don't feel any bind or drag, you are adequate to travel (the new ATAS way to say "Good to Go"). We got an Armalite one time that was REAL loose at the same place you mention. Everything else was good with the gun so we made a shim out of a pop can just to stop the rattle, but it functioned flawlessly either way.
 
pdcrig

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The acuwedge wouldn't have helped much. The TI lower has a built in nylon tensioning screw that helped some but not enough. I had a couple of leftover .004 inch cylindar end shake bearings and one was almost enough to get it tight. So I know know what I need to do. I'll just order a TI upper and make sure the part I need is right. Thanks guys.
 

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