Cheap and gimmicky - Sniper Rail Cover for Picatinny/Weaver Rails 12pc Set

They look great on the rifle but as far as function they slide everywhere. They won't stay on the rail at all. Even if you try and bend their shape they will just slip off when gripped. So they are pretty much useless unless for show. Also mine came with a green almost grey substans or something on the rubber. Possibly from sitting a a damp factory or transit or who knows. I had to wash them under the sink to remove the stuff and it didn't even come off.