That must have been some pooch screwin! Several months? wow.... no worries, you didn't need to train with it anyway right? I've been beating on mine a little bit as time is limited during hunting season, i've only had it out on 2 or 3 sessions so far with acceptable reliability. I am still testing so I can't say for sure that this is in fact better than the standard Mk4.... be safe over there & I sincerely thank you for your service.
Here is a pic (& a poor one at that) of the MK4 M5-A wearing ARC rings, next to a 1" Nikon Monarch 6.5-20: