ASG Infinity U-18000 Long Motor (high torque) Spring Guides If you're unsure of what

If you're unsure of what type of red dot sight to get for your airsoft gun

This is the popular size for longer M4 airsoft guns

NOTE: THIS ABSOLUTELY WILL NOT FIT ADULTS

If you have a stock gun and trigger

The KWA HECKLER & KOCH KWA HK USP Compact GBB Pistol - Black airsoft gas pistol

ASG Infinity U-18000 Long Motor (high torque) Spring Guides If you're unsure of whatASG Infinity U 18000 Long Motor (high torque). High TPA CNC quality motor for very heavy duty upgrades. Can use this motor in any custom upgrade gearbox build. This motor draws less power than other types and creates less heat. Uses the highest quality components for the best upgrade. U 18,000 28 TPA Rating Long axle type for most guns, most notably M4 guns.