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Posted: 11/17/2012 9:44:24 AM EST
I've been seeing this a lot lately on some ARs but mine doesn't have it. I've seen it on both sides of the AR. What is it? What is its purpose?

http://i1301.photobucket.com/albums/ag107/yearoger27/ED2D8C81-067B-46F8-880F-AD8249A4DE67-5476-00000AD22D53CB11.jpg
Link Posted: 11/17/2012 9:45:50 AM EST
[Last Edit: 11/17/2012 9:46:45 AM EST by FALZILLA]
Keeps your pins from rotating.... "anti-rotation pin" KNS Precision makes them. It's an aftermarket part and I don't think any AR's come with them?
Link Posted: 11/17/2012 9:48:35 AM EST
What's the advantage to keeping the pins from rotating? What happens when they rotate?
Link Posted: 11/17/2012 10:04:42 AM EST
Main advantage of these pins for me is they are less likely to break - particularly an issue with blowback guns like .22, 9mm etc. Anti-rotation is a secondary consideration in a regular AR.
Link Posted: 11/17/2012 11:10:02 AM EST
Originally Posted By YEAROGER27:
I've been seeing this a lot lately on some ARs but mine doesn't have it. I've seen it on both sides of the AR. What is it? What is its purpose?

http://i1301.photobucket.com/albums/ag107/yearoger27/ED2D8C81-067B-46F8-880F-AD8249A4DE67-5476-00000AD22D53CB11.jpg


Opossum?
Link Posted: 11/18/2012 3:49:27 AM EST
Most AR FCG's use a hammer with a J spring. This J spring locks in the center groove of the hammer pin causing it to rotate with the hammer. This may cause wear to the pin hole. The KNS kit stops this rotation. The KNS kit may make the trigger "feel" better because it stops pin movement within the pin holes. KNS pins are not compatible with many aftermarket FCG's.
Link Posted: 11/18/2012 5:18:19 AM EST
The advantage to this is that it helps to prevent "egg holing" of the fcg pins holes in the receiver. It'll also help keep pins in if they start walking out of their holes (most of the time that is caused by the incorrectly installed springs).

The cons would be it costs around $30, and is incompatible with Geisselle triggers, and can masquerade poor spring installation.

Most would argue its a solution looking for a problem, but I use them because I've used M16s with "egg holed" pin holes, and would like to prevent that on my own rifles.
Link Posted: 11/18/2012 5:40:12 AM EST
The slot in the new style arm allows the hammer pin to move a good bit within its limits. I doubt it would help stop the pin holes from becoming oblonged if they were going to. I can see how it would slow rotation wear
Link Posted: 11/18/2012 5:43:07 AM EST
Something most people honestly don't need.
Link Posted: 11/18/2012 5:50:02 AM EST
Really only a benefit on a machine gun. You would be better
served buying ammo with the money saved on a simi auto
AR.
Link Posted: 11/18/2012 5:57:29 AM EST
Solution to a non existing problem,,,,
Link Posted: 11/18/2012 5:58:39 AM EST
They are required for your KTO certification. You also need acuwedge, color fill, decals, hydraulic buffer, etc.
Link Posted: 11/18/2012 5:59:33 AM EST
[Last Edit: 11/18/2012 6:00:48 AM EST by par3]
They are required for your KTO certification. You also need acuwedge, color fill, decals, hydraulic buffer, BC, NIB, etc.

edit: almost forget the BC and NIB!
Link Posted: 11/18/2012 6:47:41 AM EST
I got a pair when I read enough time how they can make triggers feel better. Went through and tried them on my rifles. They made the two with spikes battle triggers feel worse. Then of the two with standard triggers. It only helped a bit on one, no difference the other. And the "better one" has a rattle can paint job and it looked silly with the black bars not painted, and I don't think their benefit was worth me painting them or buying the fde ones.

They have no other benefit I can see then possibly making a trigger better feel wise.

The DoD has receivers with tens of thousands of rounds. And I've never herd of them needing any kns pins. Egg holing just doesn't happen.

Pins walking happens only when either something is faulty or installed wrong. Millions of rifles with out them and a few walk, suddenly everyone needs em? Please. Fix your rifle.

Cheap insurence you say? I also have alien attack insurence.
Link Posted: 11/18/2012 9:39:28 AM EST
when you consider thousands of full auto rifles and carbines that run exclusively full auto and don't have them, i say placebo / kool factor.
but its not much money, and if it makes you feel better, i love it.
Link Posted: 11/18/2012 12:40:55 PM EST
Link Posted: 11/18/2012 6:00:18 PM EST
Originally Posted By 762minigun2:
Solution to a non existing problem,,,,


+1 Gimmick

Link Posted: 11/18/2012 6:28:17 PM EST
Had a J spring break and pin walked out every two shots after that to the point of doubling. Not a gimmick. Adds another layer of reliability that you probably won't need but will be glad to have it if you do. I see it as an added level of reliability like M4 feed ramps and the rubber piece in the extractor spring.
Link Posted: 11/20/2012 6:39:42 AM EST
Originally Posted By Semper_Firearms:
Originally Posted By 762minigun2:
Solution to a non existing problem,,,,


+1 Gimmick



-1. NOT a gimmick. By deleting the spring groove in the center, the KNS pins are significantly stronger. If you ever had a pin break (photo below) in the middle of a 3-Gun stage or worse situation, you will know why I now run KNS pins in my critical duty AR15s. The cost is trivial compared with the potential benefits... cheap insurance IMHO.


Link Posted: 11/20/2012 3:32:16 PM EST
Originally Posted By StealthyBlagga:
Originally Posted By Semper_Firearms:
Originally Posted By 762minigun2:
Solution to a non existing problem,,,,


+1 Gimmick



-1. NOT a gimmick. By deleting the spring groove in the center, the KNS pins are significantly stronger. If you ever had a pin break (photo below) in the middle of a 3-Gun stage or worse situation, you will know why I now run KNS pins in my critical duty AR15s. The cost is trivial compared with the potential benefits... cheap insurance IMHO.

http://i244.photobucket.com/albums/gg34/stealthyblagga/BrokenAR15TriggerPin.jpg





This center groove?
Your KNS pins must be different than mine.

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