We have not heard again from the B.L. Tech, which produces the B.O.S.S. Unit which is an attachment that gives a realistic gun sound for airsoft. Here we see another unit made in China called the X9000 Gun Sound Simulator which is being sold on Taobao.com and costs ¥399.00 or around US$60.00. It is designed like an M320 launcher to make it look more realistic.