Nugentgl gives us an overview of the RA-Tech Custom GHK M4 W.S Type 16.5-inch gas blowback rifle for this video. This is kitted out with all the upgrade parts they can find from RA-Tech, New Age, and Angry Gun... "I received this from a friend to take a look at and give my opinion.  It is RA-Tech's new custom GHK M4 using a 7075 upper/lower with Warsport LVOA markings."