Valken M4 Standard 300-Round Hicap AEG Magazine - Black Packs The 345 fps velocity means

The 345 fps velocity means this gun offers competitive performance and conservative gas usage while being field legal

For the M9A1 model

This allows you to raise your DP slightly for greater reliability without sacrificing air efficiency

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

The Valken Lens Scope Protector (RIS mounted) is a way to protect your expensive scope

Valken M4 Standard 300-Round Hicap AEG Magazine - Black Packs The 345 fps velocity meansValken M4 300 Round Hicap AEG Magazine (Black). Fits in standard M4 AEG guns of all types. Just your standard 'ole black metal M4 airsoft magazine. Pretty much the same thing as a JG M16 hicap, but made by Valken.