Probably just a matter of a few years between when his was made and when yours was made. When the Axis/Edge first came out it was completely bare bones/no frills. After a few years Savage started adding features to them here and there (AccuTrigger, heavy barrel option, hardwood stock option, etc). It could also just be a matter of changing suppliers for the trigger or a minor design revision at some point.
I will tell you this though, don't try to tap it as you'll likely just break your tap off as they're hardened.
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