Speed M4 SE2 AEG Tunable Trigger - Red Color:Blue If you're unsure of which

If you're unsure of which case to purchase

The mag's angled baseplate with angled surface is now entirely Dupont Zytel polymer for even greater ruggedness

Uses a standard AA battery type

EVEN SMALL ADULTS - ORDER THE REGULAR CROSSDRAW VEST INSTEAD

Speed M4 SE2 AEG Tunable Trigger - Red Color:Blue If you're unsure of whichSpeed Airsoft M4 AEG Externally Tunable Trigger SE2 Special Edition Blade next level tunable trigger with no gearbox modification required great for experienced player uses stock gearbox spring one external adjustment and one internal adjustment for gearbox with stock block switch or gearbox that has upgraded MOSFET board with microswitch allowed even greater adjustability over M4 SE with more trigger performance improvement