The NRA-PVF has released its grades and endorsements of candidates running for federal and state positions throughout the US.
For Michigan, the NRA has endorsed:
President - Donald Trump
US Senate - no race
US House - Bill Huizenga; John Moolenaar; Fred Upton; Tim Walberg; Mike Bishop; Paul Mitchell; Dave Trott
A complete list of candidates and grades can be found here:
https://www.nrapvf.org/grades/michigan