HK MP5 RAS KIT - Rail System G&G and the 90/4500 is a

and the 90/4500 is a tight fit

KWA MP7A1 SMG - Gas powered quality components

so you can decide which one works best

Rocket Airsoft Steel AEG Gear Set - Ultra-High Speed (13:1 gear ratio) - These gears are FAST

This is a large bottle of tracer BBs in a heavy weight

HK MP5 RAS KIT - Rail System G&G and the 90/4500 is aThe 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.