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Discussion Starter #1
I like some feedback from evryone what front pivot pins they have replaced on their Sig 556..I only know that KNS makes one not sure if there are others...and any places with best pricing recommended is much appreciated...
 

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I put the large push-pin for an H&K in....seems to work fine. Don't quote me on that though. They are cheap and user-friendly so you can't go wrong.
 

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KNS pin works fine for me. It's tight and easiest to remove with a punch from the other side as I push the button down, but it sure beats two quarters.
 

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If you search the forum, their have been a few complaints about the KNS pin.

I am trying to decide myself which pin(s) to buy. I would really like to replace both the back and front pins with the push button style, but I would like to see some photos of the fit first (have read they don't fit/look right in the back).

I am really on the fence about the cogunsales pins. I wish they weren't so expensive. To confuse the situation even more they now have both swiss and us versions for roughly the same price.
 

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Discussion Starter #5
Can't believe in this modern age Sig didnt adopt the front push pin and still is using the "2 quarter method" pin....can you see that soldier in the field somwhere in the middle east using two quaters to disassemble ?
 

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I am watching this thread too as I am getting the impression this would be a good first mod for my rifle as well. I love quick disconnects in many applications and this one seems like it would be a handy one.
 

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Meridian, the KNS pin is cool, I have one but it may increase the upper to lower play a little so be forewarned. There are enough people whining about play already, make sure your gun is satisfactory before changing stuff. :wink:
 

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hk91308 said:
Can't believe in this modern age Sig didnt adopt the front push pin and still is using the "2 quarter method" pin....can you see that soldier in the field somwhere in the middle east using two quaters to disassemble ?
The new "Classic" lowers no longer use this type of pin.
 

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Well I was pleasantly surprised when I went to field strip my new 556 and found out it is now nice and easy, right from the factory! The front pin is now just like the back pin. (Mine is a Swat Patrol from Dec 2009.)

The back pin I could push out with my finger, but the front one required a little help from a small screwdriver handle. I'm sure it will soon loosen up and require no tools. I like that the pins are captive, less parts to keep track of.

Good job Sig. (I wonder if they monitor this site, it would sure be in their best interests.)
 

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racenet said:
The new "Classic" lowers no longer use this type of pin.
...if i had one of the newer classic lowers with the captive pins...i wouldn't bother changing them out...why would you ?

...BTW...does anyone know if the newer classic lowers are less wide in the pin area...and are the new captive pins shorter...than on the previous lowers...???
 

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I also installed a KNS pin in my 556. The upper and lower have more play in them than it did with the Factory Front scerw pin. Will this play affect my Shooting and zeroing in My ACOG? :D
 

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I have a new 556 Classic, the rear pin was fine but the front for some reason was an absolute bear to get back into place. I just picked up and installed a KNS pin tonight and there is a LITTLE more slop but it basically goes away once a magazine is locked in place. I am going to shoot it this weekend and see how it feels, if everything goes off without a hitch I will keep it like it is. If not I will switch the pin back to the factory one and just keep my mallet handy.
 
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