The factory SA mag bolt head is an 1/8" longer than the standard bolt head. This makes the firing pin protrusion complicated by having to compress the spring an additional 1/8". So you would need to upgrade the firing pin to the sa magnum assembly that is designed for the longer bolt head. The long action magnum bolt head can be used bu you have to make the length of the material aft the cross pin the same length as the short action for the firing pin to fit.
PTG sells a bolt head that is already machined correctly for use with the factory standard firing pin. They also sell a more expensive custom unit that would require some more knowledge.
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