The Pulverizer Airsoft Channel unboxes and does a quick review of the SHS 70 Degree Hopup Rubber/Bucking... "This is the unboxing video of the famous SHS 70 degree hopup rubber/bucking for airsoft aeg. This is one of the affordable options for a good quality hopup rubber. Marked as the 70 degree bucking, this rubber is designed for high velocity aeg, starting from 400 fps and above. Equipped with 3 rings, this bucking is designed for a better air seal. Check this video for the unboxing and review."