Hi Iskra,

I am not sure when it came about and I am sure it was done to save money. The Mod. 70 bolts used to be one solid chunk of machined steel, at some point they put a collar on the bolt handle and pressed it on to the bolt. If you look close you will see it and that is the place I had ours welded. My pre-64 rifles are one solid piece. Any way, after reading a couple times of those pressed on collars spinning loose on the bolt body and hearing of a well known gun shop that uses "Classic" actions for their expensive rifles welding theirs up, I followed suit.

Hey Josh,
I have been using Mag-Na-Ported rifles and hand guns for over 30 years to help control muzzle jump.