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Yes, that's the kind that keeps you from messing with the adjustment of the firing pin. You would not believe what screws some people turn not knowing what can result. Jim
I was just thinking about that, going to check it on both firing pins.One more thing , since that firing pin assembly appears to have been monkeyed with, if you install it be sure to get the pin protrusion checked it should be .059 to .071 Jim
If you ever lose one or the end is all galled up Mc Master Carr sells a set screw that is close to the Sako original profile.
https://www.mcmaster.com/92905A603/
M3x0.5 x 10mm extended tip set screw used in the A and L series cocking piece to retain the firing pin... some pins were drilled so the set screw can only go in one pre-set place.
A little tricky to install which is why the firing pin has a slot in the end so you can minutely revolve it... when concentric the stepped end of the set screw drops snugly into the hole.
Others had a lateral groove milled in the firing pin which allowed a much greater degree of adjustment (0.5mm per full revolution) till the groove lines up with the screw again to reach 1.5 to 1.8mm firing pin protrusion.
If the hole or groove is missed and the set screw tightened it can gall up the threads on the firing pin... a M6 x1.0 HSS die nut will clean them back up.
If you ever lose one or the end is all galled up Mc Master Carr sells a set screw that is close to the Sako original profile.
https://www.mcmaster.com/92905A603/
M3x0.5 x 10mm extended tip set screw used in the A and L series cocking piece to retain the firing pin... some pins were drilled so the set screw can only go in one pre-set place.
A little tricky to install which is why the firing pin has a slot in the end so you can minutely revolve it... when concentric the stepped end of the set screw drops snugly into the hole.
Others had a lateral groove milled in the firing pin which allowed a much greater degree of adjustment (0.5mm per full revolution) till the groove lines up with the screw again to reach 1.5 to 1.8mm firing pin protrusion.
If the hole or groove is missed and the set screw tightened it can gall up the threads on the firing pin... a M6 x1.0 HSS die nut will clean them back up.