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AR guys: anyone use KNS anti-rotation pins?

This is a discussion on AR guys: anyone use KNS anti-rotation pins? within the Rifles forums, part of the Rifle & Shotgun Forum category; Hey guys, just bought a Spikes Tactical "enhanced" lpk that came with KNS precision anti rotation pins. The pins seem to stick out a bit ...


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Old July 9th, 2015, 05:20 AM   #1
 
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AR guys: anyone use KNS anti-rotation pins?

Hey guys, just bought a Spikes Tactical "enhanced" lpk that came with KNS precision anti rotation pins. The pins seem to stick out a bit on the right side. Is this normal? See photo below




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Old July 9th, 2015, 06:17 AM   #2
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They should be flush to the receiver. Mine do not have a gap.
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Old July 9th, 2015, 06:42 AM   #3
 
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That's what I thought. I measured the receiver and checked it against another and it's the same so I don't think the receiver is too thin. I wonder if a call to KNS or Spike's is in order...?
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Old July 9th, 2015, 07:12 AM   #4
 
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Found this on KNS's site:
Quote:
IMPORTANT NOTE: The external width of some AR receivers may vary in the trigger/hammer pin area depending on the manufacturer. Our pins may be shortened a small amount by carefully filing material evenly from both ends of the pins. The being too long will not affect the function or performance.
May try to file them a bit but that seems tedious
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Old July 9th, 2015, 07:27 AM   #5
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I'd file it and see what happens. If that fails, then call to say, "What the hey, guys!"
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Old July 9th, 2015, 09:33 AM   #6
 
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Well I decided that before I call anyone in going to see if they'll fit in another receiver and be flush. If so, then they'll stay there and this one will get standard pins.
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Old July 9th, 2015, 10:13 AM   #7
 
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Leave it alone.......will work fine as is....
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Old July 9th, 2015, 10:30 AM   #8
 
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Okay boys, educate me. Why is this needed or a good idea, aside from AR9s and full autos?

Thanks!
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Old July 9th, 2015, 02:01 PM   #9
 
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MANY years ago, GONRA made .156 inch diameter antirotation pins with 7-36 threads
(NOT a typo, its an OBSOLETE machine screw thread !)
lapped out a DPMS sear to .156 hole ID
(part centered in a 4 jaw lathe chuck, EZ-LAP in the tailstock)
usual homemade "anti rotation fork" (
rotationally/angularly locating on milled pin heads. etc.)
installed it all on my el cheao XM-15 reciever.

Now hava really nice setup for my el cheao XM-15
1/7 twist 24 inch barrel fora nice orange tip tracer (reloads) silencer blaster.
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Old July 9th, 2015, 02:19 PM   #10
 
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Quote:
Originally Posted by elchivato View Post
Okay boys, educate me. Why is this needed or a good idea, aside from AR9s and full autos?

Thanks!
Not really needed per se. It's just supposed to keep the pins from walking out of the receiver and keep them from becoming egg shaped. Keep in mind that would take a lot of shooting to do.
The pins are also stainless and give the hammer a nicer surface to ride on, rather than the hammer sticking to the pin and the pin rotating in the holes.
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Old July 9th, 2015, 04:29 PM   #11
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Originally Posted by elchivato View Post
Okay boys, educate me. Why is this needed or a good idea, aside from AR9s and full autos?

Thanks!
Biggest reason for the antiwalk pins as was stated for a loose fit in the receiver usually seen on high mileage rifles, like military. The pins cannot walk out of the receiver with the kns pins. I have seen them walk out of a private owned rifle, depends how the builder put them in on assembly. They are a great insurance buy, just in case.

As for the pins sticking out I have never seen that on any of mine, I use the gen 1 style, I believe yours are gen 2. Both are just as effective. You could file them, but they will work fine as is.
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Old July 10th, 2015, 06:15 AM   #12
 
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Progress! I discovered the culprit was the Spikes receiver is a little thinner in the trigger group area. I tried the pins on a Sig 516 receiver and they were flush.

The ambi safety was sticking out as well but not on the sig.



A standard safety I had lying around stuck out too



The solution was to grind down the ambi safety

selector

The finished mods. Sits as designed.

The Sig looks happy with its new KNS pins and CMC 3.5lb flat trigger. More on that one later

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Old July 13th, 2015, 12:39 PM   #13
 
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I wonder how the spike could be thinner in that area? I have a Spikes, and nothing is sticking out of either side, including the pins provided with the Geissele Trigger.
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Old July 13th, 2015, 01:39 PM   #14
 
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The walls are thinner on the exterior. I have other Spikes receivers that don't have this problem, so they must have changed how they are forged/milled etc.
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Old July 14th, 2015, 09:38 AM   #15
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The Sig looks excellent. I like the ambi controls. Well done!
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