Echo1 M4 CQB XK End Cap Bravo This hi capa recoil spring

This hi capa recoil spring has a special heat treated finish

Features:• Copper valve for excellent temperature distribution• Specially designed to increase gas efficiency and minimize gas loss• Stable gas flow for up to 24 shots per gas-filled magazine• Preinstalled PTS Magazine Basepad 1911 for added durability

Premium materials throughout the FN P90 SMG design

Added groove for trigger spring

or assist with acquiring optional parts

Echo1 M4 CQB XK End Cap Bravo This hi capa recoil springThis kit deletes the buffer tube and makes your M4 style AEG very compact. It has a QD swivel socket and includes a swivel as well for a sling. This will work on most M4 style AEGs though might require shortening of the back of the receiver to mount this plate.