Lonex Compression Upgrade Set w/ POM Type Piston Head for Airsoft AEG Rifles (Model: M4A1) BATTERIES Full automatic / semi automatic

Full automatic / semi automatic select fire

Longer and tighter barrels will yield a higher velocity while shorter or wider barrels will be yield a lower velocity

EMG reusable BIO-STORAGE bottle keeps the spheres away from sun

The SIG AIR ProForce MCX Virtus is a very effective

while an adapter is included to allow connection to a replica with a Tamiya small plug

Lonex Compression Upgrade Set w/ POM Type Piston Head for Airsoft AEG Rifles (Model: M4A1) BATTERIES Full automatic / semi automaticFeatures Durable steel cylinders with grooves for improved heat dissipation Internal polishing reduces friction between the cylinder and cylinder head Precision CNC machined aluminum piston head and cylinder head Steel ball bearing piston head helps with smoother rotation of spring during compression Ventilation holes in the piston head greatly increase the speed the piston travels, resulting in faster cycling Size matched piston head improves air