Great addition to my rails to keep loose wires out of the way. I had to cut one rib out of the center for my Sig 556 Fish Gill forend but works like a charm and looks good as well. On my Mossberg 500 forend, works great with no mods.
Pros: Flexible and light
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.