Lonex Compression Upgrade Set w/ POM Type Piston Head for Airsoft AEG Rifles (Model: M4A1) BATTERIES The Autobot also features a

The Autobot also features a CNC-machined high-strength steel gearset that provides excellent durability

Wear resistance with good sound elimination

smooth finish for seamless cycling and long-range accuracy

Full automatic / semi automatic select fire

except KWA) Standard M4/M16 AEG series rifles

Lonex Compression Upgrade Set w/ POM Type Piston Head for Airsoft AEG Rifles (Model: M4A1) BATTERIES The Autobot also features aFeatures 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