The current SPEED Airsoft M4 Triggers (SA3032 to SA3035) have an internal set screw and are better suited for the older block style switch

Gold finished barrel

These are good to have on hand just in case your gun goes down in the middle of the action

L85 Series Airsoft AEG Rifles

They also automatically stop charging at a full charge

HK Army AeroLite "EXTRA LITE" Tank w/ Standard Regulator (68ci/4500psi) Airsoft FN Scar The current SPEED Airsoft M4Product Overview The HK Army AeroLite Air System has been developed with performance and affordability in mind. The comprehensive system pairs a lite weight carbon fiber bottle and a reliable aluminum regulator with an output pressure of 800 psi. The AeroLite system includes a 5 year hydro cycle and is available in red, blue, and silver options. Features 68 Cubic Inch Lite Weight Bottle w 4500 psi Capacity Reliable Aircraft Grade Aluminum Regulator