Hi-lux makes Unertl replicas, however I read awhile back some shooters were using their scopes as a "base," then replace or upgrade several parts on them to make them more suitable for competition use. 5 years ago at an NRA All members meeting I had an opportunity to check out one of Hi-Lux's optics on an '03 Springfield. They appeared to be well built, but then again their 100+ year old technology is not my bag.
There are much better designs available with brighter, sturdier optics, and I would only use such an optic on an antique rifle or reproduction of an old rifle.