It's time I shared my build....
This is how my 18" AA build started in 2010. I knew that i wanted a DMR type rifle but really was unaware of the specifics for either version of the Mk12 until later.
I was facinated with the Mk12 Mod 0/1 projects having read quite a bit on them including the detailed Chapter in "The Black Rifle II" and at that time decided to use some of the components used on those rifles. Q: So why a Grendel? A: I wanted the longer reach of the cartridge and had built enough 5.56's and was not interested in another at the time. Perhaps the most interesting part of the project was the barrel work. It was done by Ron Allen from OPS Inc. He made the collar and brake to fit the AA 18" barrel. Designed to fit the 12th model supressor (That I should be able to consider by mid 2012). In addition he cut a shim for me to time the brake correctly. A real pleasure to do business with.
So, after two years of "research" and learning (more like misdirection) more about what the "real build" spec's were for the Mk12 Mod 1 (subjective, of course, to which version carried by which branch of the services and the amount of $$$ allocated to said project! That means no select fire for me). I took a few "liberties" here and there other than the caliber. I rebuilt the rifle to where she is now at the beginning of 2012:
I haven't taken out this version to the range yet because I am still working on it (I need those Zero stop turrets!) but, I am sure it will shoot just as good as the other variations it has been through. Maybe a bit better with the "high-end" glass (That is if I can find the best 123gr/Powder combo... haven't found it yet... and quit using so much caffeine!). So while this build will never be "accurate" to the true Mk12 afficiando, I offer it here on this forum which is where it belongs anyway. Hope you all enjoy and get inpired as I have!