08/07/2026
Here’s an update on that PTR I posted the video of last weekend that was having slam fires when charging the first round.
Top firing pin and spring are from a G3 I am building for a customer, bottom firing pin and spring is from the PTR. Notice there is approximately one coil difference in length. That means it’s not only shorter, but also weaker than the factory spring. While it doesnt seem like much, in a G3 type rifle, the charging of a round is a violent process when compared to something like an AR platform. After switching springs, I have not had a slam fire when charging a round.