My first mauser bolt welded on. Used 220 mig. Brownells bolt handle,heat sink and heat paste. I underestimated how efficiently the heat sink would pull out heat. The next one I do I will have the welder turned up another heat notch. But I beat this thing off of my work bench as hard as I could. Didnt even shake. How did I do? I have since filed and shaped and smoothed lot more.