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HK MP5 RAS KIT - Rail System G&G Prometheus MP5K and PDW AirThe HK MP5 MP5 RAS KIT Rail System. Fits on all MP5 style AEGs (from Umarex), and possibly others. Convert your front handguard into a beast of a gun with this RAS kit. Adds full rails and a very large battery compartment for bigger battery installs. Includes everything needed! Full polymer (furniture) and metal construction (rails, barrel brace). Also includes HK style front forward grip! Customize your MP5 and own the battlefield.