Airsoft Electric Gun Parts - Guard Hopup Rubber
Hop-up's main function is to increase the range of the BBs travel,
making for longer shots. However, not all airsoft guns have a hop-up mechanism
(check the make and model of your gun).
How it works
The hop-up mechanism on an airsoft gun imparts backspin on the BB.
An adjustable piece of rubber provides resistance on the upper part
of the BB when fired, causing backspin.
The hop-up lever adjusts the amount of backspin you impart on the BB
-- from normal (zero hop) to full pressure. Fire a few shots to set the
lever to its optimum setting. Start at zero hop, shoot a few rounds,
adjust for more hop and observer the trajectory. If the BBs tend to drop,
increase hop-up. When they begin to magically fly upwards,
you're putting too much backspin -- lower the setting. Additionally,
excessive pressure and backspin may also result in premature drop.