The SureFire M77 Picatinny rail forend is a high-quality Picatinny forend for the HK MP5K/MP5K-PDW that replaces the weapon's stock forend allowing the user to mount a variety of accessories. Machined from military specification hard-anodized aluminum, they're stronger, dissipate heat much better, and provide rock-solid weapon fit. These precision rails enable consistent "repeat zero" of any accurately dimensioned devices attached to them, such as SureFire lasers or WeaponLights.