So, i am building a gun and I will be using a base gun which will be an standard m4a1. I have in mind the three linked below. I will only keep the stock tube and the gearbox since I'm pretty much replacing everything else. Which of the below has the best gearbox? Which has the best stock tube?
JG ENHANCED- http://www.airsoftpost.com/product_info ... s_id=29002
G&G- http://www.airsoftpost.com/product_info ... s_id=30418
MATRIX- http://www.airsoftpost.com/product_info ... s_id=32721