AR-15 Rattle Rattle

DarrellA · Feb 15, 2017

I must have lucked out. The upper and lower on my AR-308, built from an 80% lower, is tight.

The takedown pin keeps backing out though. Instead of looking for a stronger spring, I may just drop a 2nd detent pin in there to compress the existing spring more. Any thoughts on that approach?

outrider58 · Feb 15, 2017

DarrellA said:
I must have lucked out. The upper and lower on my AR-308, built from an 80% lower, is tight.

The takedown pin keeps backing out though. Instead of looking for a stronger spring, I may just drop a 2nd detent pin in there to compress the existing spring more. Any thoughts on that approach?

Maybe try and make your own extended detent pin. Make two in case the first one sprouts wings.

good guy 176 · Feb 15, 2017

Shot the AR in competition for several years. Used a lockable screw as the rear pin on the match service rifle and that worked swell.

A fast fix is to open the halves and stretch a heavy rubber band across the opening, close the halves and trim the excess off both sides...this is a super quick fix that does the same as installing a rubber wedge.

Any error from a small wiggle of the two halves will not be noticed on paper by the average shooter.

Lew--Ranger63

trickg · Feb 15, 2017

When I was in basic training, my M16 rattle so much, I have always referred back those rifles that we used as "rattle traps." Seriously, consider that I went to basic training in 1989 with an M16 rifle that had the serial number 4786107.

If you look this up, it appears that my basic training M16 was manufactured in 1971:

http://namcom.foroactivo.com/t104-m16-serial-numbers

4,701,901-4,844,400
1971
US Property marked M16A1.

So yeah, it rattled. A lot. It's one of the loosest M16s/AR15s I've ever come across. Then again, most of the ones my company was using were loose like that, and no one seemed to think anything about it.

dist1646 · Feb 15, 2017

Many years ago, I designed a tensioning screw modification to cure receiver play. I gave the design to the Marine Corp RTE shop at Quantico. Probably should have patented that one! If you want to reduce play between the upper and lower, a little glass bedding under the rear lug will do the trick. It does reduce the amount of verticle dispersion at 600yds.

byf43 · Feb 15, 2017

Duct Tape!!!!!!!!!

:thumbsup:

Jus' kiddin'!

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