Advantages:

Replaceable grip area (Comes standard with the Tactical grip and one Mask grip)
Functions as a flared and extended magazine well, enhances reload speed under stress
Quick and easy installation
Durable and lightweight fiberglass reinforced polymer construction
Available in Black, Olive Drab Green or Flat Dark Earth
:

There are 4 types of sets (different types can be replaced at will)
5.56x45 lower receiver variants, without a flared magazine well.
May not work well with the PMAG GEN3