If you have a standard M4 with a tapered, 7" handguard and want to instal a foregrip or flashlight, but you can't afford a whole rail system, these rails are a great option for you. These rails come with all the hardware required to instal them on your lower or upper handguard. They are also tapered to sit straight on your handguard so that lasers and flashlights point in the right direction, in line with your barrel.
Included is 1 rail, 2 nuts and bolts, 2 lock washers, and an allen key for installation.

Note: Your handguards must have open vent holes on the top or bottom for this rail to fit. otherwise, modification will be necessary.