Great rifle. My take is that it's a 7.62x51 NATO beast so it has it's place from the start, which isn't a CQB bullpup. The barrel HK put on the rifle certainly delivers accuracy (and weight), that in addition to the tight tolerances, polishing, and high-end materials. Expensive, but any quality 7.62x51 AR-10 derivative is (LWRC, LaRue, KAC, LMT, etc.).
I've had pretty good luck going sub-MOA (3/4-MOA) with 168gr loads. I have some Black Hills and Hornady stuff I will be trying soon to see how they group.
It's not a 417, but a 417 isn't an MG121. Hoards of those who populate AR15(dot com) will have you think you need a 7.62x51 battle rifle for breaching doors for your weekend snatch/grab tango operations and the only solution is the HK 417. Rest assured those who ACTUALLY do that stuff are using "organizational" weapons and not lingering in anti-MR762 discussions.