Aka M110A1. The military variant of the HK MR308, which is the civilian variant of the HK417, and not parts compatible with either, and needs special 7.62 NATO ammunition, because regular is too mainstream. Thanks a lot, HK.

…ingame, she's a DMG-buffing rifle like Lee-Enfield and M14, with stats somewhere between the two. Harder to get than M14, easier to get than Lee, that's perfectly reasonable and you can put her in a hydra bullying echelon with either.

However, with the multitude of rifles available now, she's definitely outclassed by a lot of them, most notably FN-49 mod and M14 mod. Raise her if you want, since she's not bad but it's a questionable investment with so many other options.