Falcon Industries manufactures a line of Low Profile Rail Covers for AR-15/M16 and compatible rifles under their Ergo Grip Trademark. These rail covers clip directly onto Picatinney rail configurations.They form a very low profile grip and they protect the unmounted rail areas from damage. They also protect the weapon user from injuries and protect gear such as clothing and repelling ropes from damage caused by any sharp edges on the Picatinney rails. These rail covers available in 8 different configurations (SKUs). The Low Profile Rail Covers come two sizes, short and long. The small size covers 5 slots (3 required per M-4 rail section). The long size covers 18 slots and can easily be cut to a custom length.