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Posted: 12/1/2007 9:59:37 PM EDT
So, I picked up an AR and there was one of those little rubber wedges behind/under the takedown pin.

The Upper and Lower are a pretty good fit already...and really tight with the wedge. So what are those little suckers really supposed to do...and do they do it?
Link Posted: 12/1/2007 10:03:52 PM EDT
I'm pretty sure you just answered your own question.
Link Posted: 12/1/2007 10:05:44 PM EDT
if your upper and lower receiver are loose and rattle a lot they will quiet the rattle. if they already fit together good their is no need for the rubber wedgie.
Link Posted: 12/1/2007 10:48:02 PM EDT
[Last Edit: 12/1/2007 10:48:18 PM EDT by AgHistGrad02]
I don't see the point anyway. I don't think it effects the accuracy of the rifle if theres a little wobble.
Link Posted: 12/1/2007 11:02:45 PM EDT

Originally Posted By AgHistGrad02:
I don't see the point anyway. I don't think it effects the accuracy of the rifle if theres a little wobble.


Seeing as how the barrel, bolt/carrier, and optics are all built into the upper, probably not much.

However, the same goes for bolt guns, yet glass bedding stock is supposed to help. I think the wedge falls under the same concept. Increase rigidity and reduce wobble in the platform to improve accuracy (actually, the proper term would be precision, or the ability of the rifle to consistently make shots with little variation).
Link Posted: 12/2/2007 1:33:48 AM EDT
I wont buy one

I heard that some OLDER COLTs came with them
Link Posted: 12/2/2007 2:06:39 AM EDT
Wallet lightener.
Link Posted: 12/2/2007 2:43:19 AM EDT

Originally Posted By osprey21:
Wallet lightener.
Of a whole $3? Thats less then a gallon of 87 oct.
Link Posted: 12/2/2007 4:11:01 AM EDT
My Colt HBAR CNMT came with one. I put them in if there is any play between receivers but that's just because I like the more solid feel they give the rifle. I don't think they help accuracy unless your receiver fit is so bad that the cheek weld changes slightly?
Link Posted: 12/2/2007 4:37:03 AM EDT
They are also said to prevent tight fitting receivers from loosening by reducing the enlarging of the take-down pin hole caused by firing and impacts. Many older ARs get loose from this type of wear. The Accuwedge may do this, but it would take a long study to prove it.
Link Posted: 12/2/2007 6:40:39 AM EDT
Link Posted: 12/2/2007 6:46:48 AM EDT

Originally Posted By osprey21:
Wallet lightener.


A Big +1.
Link Posted: 12/2/2007 7:16:09 AM EDT

Originally Posted By Scooter1942:
So what are those little suckers really supposed to do


Appease the folks with OCD.
Link Posted: 12/2/2007 7:18:28 AM EDT
Make the fit tighter. They do work I have them in all my guns.
Link Posted: 12/2/2007 7:21:47 AM EDT

Originally Posted By Bradd_D:

Originally Posted By Scooter1942:
So what are those little suckers really supposed to do


Appease the folks with OCD.


+13
Link Posted: 12/2/2007 8:14:37 AM EDT
They'll make your gun more accurate... Hence the name....
Link Posted: 12/2/2007 8:54:39 AM EDT
[Last Edit: 12/2/2007 8:56:00 AM EDT by Russ4777]

Originally Posted By Harv24:
They'll make your gun more accurate... Hence the name....


Hmmmmmm.......doubtful. The wobble and slop is mostly psychological.
Link Posted: 12/2/2007 9:13:52 AM EDT
I've had them in a couple of Colts. My S&W MP15T and my Armalite don't need them.
Link Posted: 12/2/2007 9:59:13 AM EDT
Russ4777


Hmmmmmm.......doubtful. The wobble and slop is mostly psychological.


Russ... Run a diagnostic check on your "sarcasm" meter... I think it's out of calibration......
Link Posted: 12/2/2007 12:37:31 PM EDT

Originally Posted By Harv24:
Russ4777


Hmmmmmm.......doubtful. The wobble and slop is mostly psychological.


Russ... Run a diagnostic check on your "sarcasm" meter... I think it's out of calibration......


Don't worry Harv, I understand your intent. Perhaps if the guy puts in two AW's the rifle will be twice as accurate.
Link Posted: 12/2/2007 12:50:33 PM EDT
Link Posted: 12/2/2007 12:52:46 PM EDT
So does it push on the takedown pin, or does it push against the BCG?

If it pushes against the BCG, wouldn't it wear out pretty quickly?
Link Posted: 12/2/2007 12:54:31 PM EDT

Originally Posted By Old_Painless:
In case any reader is unfamiliar with these things, here is one installed.

photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=20930



Excellent pic friend!

I think it's more of a feel good device. If you have some slop, it's not required. if you have lots of slop, it can't hurt but it may or may not help anything.

It's your thing (and your money) do what you wanna do.

Danny
Link Posted: 12/2/2007 12:58:14 PM EDT
Link Posted: 12/2/2007 1:06:56 PM EDT

Originally Posted By freerider04:
So does it push on the takedown pin, or does it push against the BCG?

If it pushes against the BCG, wouldn't it wear out pretty quickly?


They push against the upper receiver take down pin lug.
Link Posted: 12/2/2007 1:08:39 PM EDT
Bah. Those are the words I was looking for when I put in pin.

Okay then.
Link Posted: 12/2/2007 1:19:16 PM EDT
[Last Edit: 12/2/2007 1:22:46 PM EDT by FrankSymptoms]

Originally Posted By Minuteman419:

Originally Posted By Old_Painless:
In case any reader is unfamiliar with these things, here is one installed.

photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=20930



Excellent pic friend!

I think it's more of a feel good device. If you have some slop, it's not required. if you have lots of slop, it can't hurt but it may or may not help anything.

It's your thing (and your money) do what you wanna do.

Danny


My own AR is pretty tight, so I've never had any reason to install one. But it seems to me that if there is slop between the upper and lower of your rifle, it CAN affect accuracy. If the slop is one direction while 'relaxed' (i.e., just before you fire), then the recoil of the upper against the lower will introduce a little bit of movement as the gun is firing... resulting in some barrel misalignment.

All this takes place in a fraction of a second so it isn't real obvious. But what would any of us do to gain, say, 1/2 MOA of accuracy? This question is NOT academic; there are several factors that will affect accuracy. If you have a potentially perfect rifle, capable of firing one-hole groups at 100 yards, but have 5 error factors that each introduce 1/2 MOA of inaccuracy, then your rifle won't shoot better than 2 1/2 inches at 100 yards. This is called "cumulative error." You must eliminate ALL these errors in order to shoot that perfect score.
Link Posted: 12/2/2007 1:53:49 PM EDT

Originally Posted By FrankSymptoms:

Originally Posted By Minuteman419:

Originally Posted By Old_Painless:
In case any reader is unfamiliar with these things, here is one installed.

photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=20930



Excellent pic friend!

I think it's more of a feel good device. If you have some slop, it's not required. if you have lots of slop, it can't hurt but it may or may not help anything.

It's your thing (and your money) do what you wanna do.

Danny


My own AR is pretty tight, so I've never had any reason to install one. But it seems to me that if there is slop between the upper and lower of your rifle, it CAN affect accuracy. If the slop is one direction while 'relaxed' (i.e., just before you fire), then the recoil of the upper against the lower will introduce a little bit of movement as the gun is firing... resulting in some barrel misalignment.

All this takes place in a fraction of a second so it isn't real obvious. But what would any of us do to gain, say, 1/2 MOA of accuracy? This question is NOT academic; there are several factors that will affect accuracy. If you have a potentially perfect rifle, capable of firing one-hole groups at 100 yards, but have 5 error factors that each introduce 1/2 MOA of inaccuracy, then your rifle won't shoot better than 2 1/2 inches at 100 yards. This is called "cumulative error." You must eliminate ALL these errors in order to shoot that perfect score.


While I am inclined to agree with you, Armalite's testing appears to show that a little wobble isn't a problem.

Maybe they weren't going for that one-hole group.

Either way, since the wedge is so cheap, I wouldn't criticize anyone for buying one.
Link Posted: 12/2/2007 2:01:21 PM EDT

Originally Posted By PromptCritical:
While I am inclined to agree with you, Armalite's testing appears to show that a little wobble isn't a problem.

Maybe they weren't going for that one-hole group.


Don’t forget the Army Markmanship Unit's thoughts too. I think those fellas might know a thing or two about accuracy.
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