BCM or Rainier Upper Receiver

AR/M4 AR General Discussion
1

Which would you choose? My only issue with the BCM is I read the reviews and some complained about the M4 feed ramps being almost non existant.
Has anyone used the Rainier? I’m mating it to a Rainier Ultra Match barrel.

2

Please try a search first. A search of “rainier” brings up over 11 pages of info.

Thanks