Pivot pin question

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02-26-20, 15:09
OLIAR15

Pivot pin question

So I bought this 1981 SP1 carbine end last year. Gorgeous, nimble, light and simple, and quite rare around here (Switzerland).

https://uploads.tapatalk-cdn.com/202...0e8f9b61.plist

But it had this weird looking pivot pin

https://uploads.tapatalk-cdn.com/202...ca29f4918b.jpg

https://uploads.tapatalk-cdn.com/202...a76c61c8.plist

Instead of the normal two screws pin

https://uploads.tapatalk-cdn.com/202...bec7ae23.plist

At first I thought I needed to find an original pin. But then I started liking this device : the fit is perfect, it’s tight, and allows an instant disassembly of the upper and lower as was originally intended.

So now instead of replacing this by the original two screw, I am thinking of converting my other large pin Colt’s with this .... if I can find it.

It looks very similar to the pins used on HK weapons

https://uploads.tapatalk-cdn.com/202...c84f4b8aaf.jpg

https://uploads.tapatalk-cdn.com/202...ac2c728cde.jpg

But from my research the HK ones are smaller, both in length and diameter.

So I am looking for clues which weapon is using this, and if I can find a few.

Here are pictures and the dimensions in two standards

https://uploads.tapatalk-cdn.com/202...301847e302.jpg

https://uploads.tapatalk-cdn.com/202...28ecf87f9c.jpg

https://uploads.tapatalk-cdn.com/202...3a01315d3f.jpg

https://uploads.tapatalk-cdn.com/202...6e9453dc09.jpg

https://uploads.tapatalk-cdn.com/202...75afe6f45f.jpg

https://uploads.tapatalk-cdn.com/202...e6d7fecb0c.jpg

https://uploads.tapatalk-cdn.com/202...bdbb518ce1.jpg

https://uploads.tapatalk-cdn.com/202...35a0405ea6.jpg

https://uploads.tapatalk-cdn.com/202...4cfa11b91f.jpg
02-26-20, 16:16
jsbhike

Same idea, but a slightly different execution.

https://www.knsprecisioninc.com/prod...t-pin-315-dia/

Never measured one, but the .315" vs. .314" may be a point to look at.
02-26-20, 16:25
OLIAR15

Thanks a lot, I’ll probably buy a few of those if I can’t find the one I’m looking for
02-26-20, 16:34
jsbhike

On the chance that wasn't originally an SP1 replacement, you might check hardware suppliers in your area for something along the lines of a self locking clevis pin. We have something similar to that pin here, but with a slightly different spring retainer.
03-07-20, 15:42
mlberry

Remember the original SP1 had a two screw pivot pin and it was a little larger than mil spec so that SP1 uppers and lowers did not fit with military uppers and lowers. This is probably after market. If it works don't worry about it, just enjoy it. I have an after market quick disconnect pin on my SP1 different from this, but it works fine. I still have the original double screw pin, but I never use it.
03-10-20, 11:09
MQ105

Maybe this?

https://www.opticsplanet.com/daniel-...pivot-pin.html
03-10-20, 17:42
OLIAR15

Quote:

Originally Posted by MQ105

Maybe this?

https://www.opticsplanet.com/daniel-...pivot-pin.html

Thanks but discontinued by manufacturer
03-11-20, 01:17
Dennis

Quote:

Originally Posted by OLIAR15

Thanks but discontinued by manufacturer

I'm pretty sure I have one in my parts bin if you really want it

But I do like the one you have more!

Dennis.
03-11-20, 04:27
OLIAR15

Quote:

Originally Posted by Dennis

I'm pretty sure I have one in my parts bin if you really want it

But I do like the one you have more!

Dennis.

Thanks, I’ll be happy to buy it from you.

I like the one I have too, but I have only one pin and 5 rifles. And I still have not identified its origin.