AR10/AR9MM CARBINE BUFFER SPRING (AR-9 WITH FOSTECH ECHO 2)

Description

THIS IS THE ONLY SPRING YOU CAN USE WHEN UTILIZING THE FOSTECH ECHO 2 IN A 9MM PLATFORM, COUPLED WITH AN H2 BUFFER.

IF YOU’RE USING THIS SPRING WITH A 9MM AND FOSTECH ECHO 2 TRIGGER, YOU’LL ALSO NEED THIS BUFFER

THIS SPRING WILL WORK AS A CARBINE BUFFER SPRING FOR AR10 PLATFORMS.