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no1toylover
May 17, 2016, 16:50
Hi,

I came across this hinge pin but never seen one like this before anyone know what it is from or for?

http://i961.photobucket.com/albums/ae96/Leonstoys/FAL%20Hinge%20pin%20-%201_zpsog62oa4z.jpg (http://s961.photobucket.com/user/Leonstoys/media/FAL%20Hinge%20pin%20-%201_zpsog62oa4z.jpg.html)

nwobhm
May 17, 2016, 17:18
Looks like the male end if a pivot pin screwed into a recoil spring tube nut. Is the nut slotted?

no1toylover
May 18, 2016, 06:45
the left looks like a normal split pin, the right is odd, this was in a FN package but no number or id on it.

gunplumber
May 18, 2016, 07:45
Looks like the male end if a pivot pin screwed into a recoil spring tube nut. Is the nut slotted?

This.

Which makes it an L1A1 I believe, as the FAL and L1A1 are different pitch. L1A1 is 1/4x28, same as the buttpad screw.

FAL is 1/4x32 (?) so should only screw in a couple turns before it binds.

Anyway - that's what it is.

no1toylover
May 19, 2016, 02:05
thank you,

Howerer, I own several L1A1 and FAL's non have this pin, that has a thread on one side. the thread showing is around 1/2 inch.

My FN factory book does not show this part either....

gunplumber
May 19, 2016, 07:39
thank you,

Howerer, I own several L1A1 and FAL's non have this pin, that has a thread on one side. the thread showing is around 1/2 inch.

My FN factory book does not show this part either....

Sir, I do this for a living. I know of what I write.

It is part #14 incorrectly screwed into part #8.

Part #14 (Hinge pin assembly, left side) on a FAL is threaded 1/4"x32tpi and on an L1A1 is treaded 1/4"x28tpi. Part #8 is internally threaded 1/4"x28 on both FAL and L1A1, for the buttpad screw. Thus, if the hinge pin threads into the return spring plug completely, it is off an L1A1. If it screws in halfway and binds (threads don't match in pitch), it is a FAL hinge (left).

http://www.arizonaresponsesystems.com/store/l1a1-lower/diagram-l1a1-lower.jpg

On the FAL trigger housing drawing it is part #10

http://www.arizonaresponsesystems.com/store/fal-lower/diagram-fal-lower.jpg

Part #10 is screwed into part # 5 from the shoulder stock assembly drawing.

http://www.arizonaresponsesystems.com/store/fal-lower/fal-buttstock.jpg

no1toylover
May 23, 2016, 05:34
Hi Yes,

Gunplumer you could be correct there thank you for spotting this... I was confused as it was all in one FN package...

Thank you

gunplumber
May 23, 2016, 07:22
It's not a matter of I "could" be correct.

I am correct.

J. Armstrong
May 23, 2016, 07:39
Mark didn't earn the title "arrogant bastard" for nothing :biggrin::beer:

Believe the man because - yes - he is correct :shades:

no1toylover
May 24, 2016, 14:14
Only got back today, yes correct the metric return spring screw... thank you guys :fal::fal::fal: