Here is my one-shot critical Nataruk build.

Some potential changes you can make:
-Point Strike instead of Critical Delay
-No exilus slot
-A riven instead of Hunter Munitions
-Bladed Rounds instead of Hunter Munitions
-Galvanized Aptitute instead of [Hunter Munitions]

Whether you do or don't make these changes, you can easily obtain red crits and oneshot Steel Path enemies without slash procs. Armor stripping is not necessary to one-shot normal units, but it might be against eximus or others in Steel Path.

Anyways, have fun with those red numbers!