5.7x28 Factory Light Strikes

[Lu249]

I currently built a WWSD 2020 in 5.7x28 but when I went to sight it in, about half of the rounds were light strikes. I’m not sure if the 5.7x28 had harder primers or it’s something with my firing pin. I was shooting the SS197SR blue tipped VMAXs. Any suggestions?

 

[LoonWulf]

Usually my first thought on light strikes is hammer spring in backwards, seen it happen to a fair number of people.