This is a Ergo Grip Accessory known as the Ext Rail Length Protector, model 4373-3PKOD.
ERGO Grip's 18-Slot Low-Pro Ladder Rail Cover (3-pack) protects unmounted rail areas on your Picatinny rail from damage and shields the operator from sharp rail edges. Easy to install" they cover the rails of your quad rails while the rubberized texture protects your accessories. Molded of highly tactile Santoprene allows for improved weapon control with a low profile and a rubbery" high-friction texture. This is a package of three 18 slot 7" ladder rail covers.
Features:
18 Slot 7 ladder rail covers
Protects rails from damage and protects shooters from rail edges
Easily trimmed for custom fitting
