After trying a few other style offset rail systems I saw the Black Hawk design and have to say it leaves the others far behind. Having a 45 degree rail that does not clear your sight or other accessories, even parts of the weapon, is useless. The Black Hawk design puts you red dot back up or other devices clear of existing furniture and other accessories.
Pros: Best design I've seen
Cons: None
This review was written in the old system and had content requirements that are different than reviews written today.