This bcm pkmr handguard is a direct replacement featuring a simple drop-in design.It is for a mil-spec m4 type ar15 with a mid length gas system and mil-spec front sight base.The pkmr handguard has a slim and lightweight design and features reinforced keymod mounting surfaces for durable accessory support an aggressive textured area for enhanced traction and has an aluminum heat shield to reduce heat transfer to the handguard and the shooters hand.This pkmr model will only fit a triangle m16 type handguard retaining cap.Made in the usa.Rails: KeyModType: HandguardFirearm Type: AR PlatformFirearm Model: AR-15Material: PolymerFinish: TexturedFeatures: KeymodPositions: 3