View Full Version : firing pin protrusion specifications - firing pin wear symptoms

L1A1 shooter 1
September 20, 2001, 18:40
(formerly: (Is there a way of tell if your firing pin is worn out ??")

my l1a1 sometime hits the primers but no fire,,my new imbel rifle fired this same ammo fine,,,ty if u can help*me on this ;)

[ September 21, 2001: Message edited by: gary.jeter ]

September 20, 2001, 19:14
I'm pretty sure that the acceptable range of firing pin protrusion is
1.334mm= 0.05251953" (0.053)
1.566mm= 0.06165336" (0.062)

I believe this is the gage issued to armorers

See also http://www.l1a1.com/cgi-bin/forums/ultimatebb.cgi?ubb=get_topic&f=3&t=002057

Keep in mind that several things other than firing pin wear can cause light strikes.
Excess headspace
Weak springs
Friction in the wrong places

NZ L1A1 Collector
September 21, 2001, 02:26
Official Firing Pin Protrusion for the L1A1:

Max: 0.058 in.
Min: 0.050 in.

This is from the British EMER, SA & MG D118, Iss 9, Dec 81.

Bruce Allen
September 21, 2001, 05:24
You can also tell when it is time when they break.

I took a friend out last weekend to expose him to the FAL and the pin broke right where I had heard it could. I already had a two piece firing pin as a spare and installed it and kept right on shooting.
I was alerted of the trouble when the rifle began jamming upon feeding the first round of a fresh mag, as the pin was protruding from the bolt face and was stopping the cases from sliding in to the correct position when loading.

September 21, 2001, 21:05
Does this mean...

1) The gauge gary pictured is not an FAL tool but belongs to another rifle family?

2) If it IS an FAL gauge, and clearly Metric, since it differs from the figures quoted by Kevin are there two separate sets of specifications for Metric- and Inch-pattern firing pins?

This is one of the parts I keep in my shooting bag anyway, see honey some of those kits really WERE for spares... Oh look, these receivers are on sale... :D


L1A1 shooter 1
September 21, 2001, 21:07
ok,,where can i get 1 of these guages @ ??? ;)