Saiga AK47 light primer strike (fail to fire)

[random_gun]

Today I had 2 fail-to-fire at the range. It was around 35F.
I pulled the trigger halfway, get a clear view at the target and slowly pulled the trigger all the way down. It did not fire.
The cartridges look good (Brown Bear HP), a very light strike on the primer compared to normally fired rounds. I can barely see the strike from pictures.

What can be the cause of the problem? I have fired nearly 1000 rounds, 2 and only 2 in 500 Brown Bear ammo failed to fire. Is this because of the way I pulled the trigger(too slow)? Or I should check something else.

Btw I lost the firing pin removal tool, is there any place I can get it (a generic tool is ok as long as it can get the job done) for cheap? Last time I checked the AK buttstock toolkit is kinda pricey.

 

[fireman 9731]

Make sure there isn't crud buildup on the bolt face or breach. Out of spec ammo is a possibility and most likely due to the AK's robust firing mechanism. You can use any punch that will fit it to take the bolt apart. Do that and make sure the firing pin and channel are clean and oil/grease free. If it still does it with different ammo then we will have to do some more head scratching.

Also make sure that it was fully in battery when you had the light strikes. If you have a lot of grease in it, and it was cold, it may not of been fully returning to battery.